Physics:Room-temperature superconductor

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Short description: Material which exhibits superconductivity above 0 °C
Question, Web Fundamentals.svg Unsolved problem in physics:
Is it possible to make a material that is a superconductor at room temperature and atmospheric pressure?
(more unsolved problems in physics)

A room-temperature superconductor is a hypothetical material capable of displaying superconductivity at temperatures above 0 °C (273 K; 32 °F), which are commonly encountered in everyday settings. As of 2023, the material with the highest accepted superconducting temperature was highly pressurized lanthanum decahydride, whose transition temperature is approximately 250 K (−23 °C) at 200 GPa.[1][2]

At standard atmospheric pressure, cuprates currently hold the temperature record, manifesting superconductivity at temperatures as high as 138 K (−135 °C).[3] Over time, researchers have consistently encountered superconductivity at temperatures previously considered unexpected or impossible, challenging the notion that achieving superconductivity at room temperature was unfeasible.[4][5] The concept of "near-room temperature" transient effects has been a subject of discussion since the early 1950s.

Significance

The discovery of a room-temperature superconductor would have enormous technological significance. It has the potential to address global energy challenges, enhance computing speed, enable innovative memory-storage devices, and create highly sensitive sensors, among a multitude of other possibilities.[5][6]

Reports

Since the discovery of high-temperature superconductors ("high" being temperatures above 77 K (−196.2 °C; −321.1 °F), the boiling point of liquid nitrogen), several materials have been claimed, although not confirmed, to be room-temperature superconductors.[7]

Corroborated studies

In 2014, an article published in Nature suggested that some materials, notably YBCO (yttrium barium copper oxide), could be made to briefly superconduct at room temperature using infrared laser pulses.[8]

In 2015, an article published in Nature by researchers of the Otto Hahn Institute suggested that under certain conditions such as extreme pressure H2S transitioned to a superconductive form H3S at 150 GPa (around 1.5 million times atmospheric pressure) in a diamond anvil cell.[9] The critical temperature is 203 K (−70 °C) which would be the highest Tc ever recorded and their research suggests that other hydrogen compounds could superconduct at up to 260 K (−13 °C).[10][11]

Also in 2018, researchers noted a possible superconducting phase at 260 K (−13 °C) in lanthanum decahydride (LaH10) at elevated (200 GPa) pressure.[12] In 2019, the material with the highest accepted superconducting temperature was highly pressurized lanthanum decahydride, whose transition temperature is approximately 250 K (−23 °C).[1][2]

Uncorroborated studies

In 2000, while extracting electrons from diamond during ion implantation work, Johan Prins claimed to have observed a phenomenon that he explained as room-temperature superconductivity within a phase formed on the surface of oxygen-doped type IIa diamonds in a 10−6 mbar vacuum.[13]

In 2003, a group of researchers published results on high-temperature superconductivity in palladium hydride (PdHx: x>1)[14] and an explanation in 2004.[15] In 2007, the same group published results suggesting a superconducting transition temperature of 260 K,[16] with transition temperature increasing as the density of hydrogen inside the palladium lattice increases. This has not been corroborated by other groups.

In March 2021, an announcement reported superconductivity in a layered yttrium-palladium-hydron material at 262 K and a pressure of 187 GPa. Palladium may act as a hydrogen migration catalyst in the material.[17]

On July 23, 2023, a Korean team claimed that Cu-doped lead apatite, which they named LK-99, was superconducting up to 370K, though they had not observed this fully.[18] They posted two preprints to arXiv,[19] published a paper in a journal,[20] and submitted a patent application.[21] The reported observations were received with skepticism by experts due to the lack of clear signatures of superconductivity.[22] The story was widely discussed on social media, leading to a large number of attempted replications, none of which had more than qualified success. By mid-August, a series of papers from major labs provided significant evidence that LK-99 was not a superconductor, finding resistivity much higher than copper, and explaining observed effects such as magnetic response and resistance drops in terms of impurities and ferromagnetism in the material.[23][24]

Retracted or unreliable studies

A magnet is suspended over a liquid nitrogen cooled high-temperature superconductor (-200°C)
A magnet levitating above a superconductor (at -200°C) that is exhibiting the Meissner effect.

In 2012, an Advanced Materials article claimed superconducting behavior of graphite powder after treatment with pure water at temperatures as high as 300 K and above.[25] So far, the authors have not been able to demonstrate the occurrence of a clear Meissner phase and the vanishing of the material's resistance.

In 2018, Dev Kumar Thapa and Anshu Pandey from the Solid State and Structural Chemistry Unit of the Indian Institute of Science, Bangalore claimed the observation of superconductivity at ambient pressure and room temperature in films and pellets of a nanostructured material that is composed of silver particles embedded in a gold matrix.[26] Due to similar noise patterns of supposedly independent plots and the publication's lack of peer review, the results have been called into question.[27] Although the researchers repeated their findings in a later paper in 2019,[28] this claim is yet to be verified and confirmed.[citation needed]

Since 2016, a team led by Ranga P. Dias has produced a number of retracted or challenged papers in this field. In 2016 they claimed observation of solid metallic hydrogen in 2016.[29] In October 2020, they reported room-temperature superconductivity at 288 K (at 15 °C) in a carbonaceous sulfur hydride at 267 GPa, triggered into crystallisation via green laser.[30][31] This was retracted in 2022 after flaws in their statistical methods were identified and led to questioning of other data.[32][33][34][35][36][37] In 2023 he reported superconductivity at 294 K and 1 GPa in nitrogen-doped lutetium hydride, in a paper widely met with skepticism about its methods and data. Later in 2023 he was found to have plagiarized parts of his dissertation from someone else's thesis, and to have fabricated data in a paper on manganese disulfide, which was retracted.[38] The lutetium hydride paper is also being reviewed for retraction.[citation needed] The first attempts to replicate those results failed.[39][40][41]

Theories

Metallic hydrogen and phonon-mediated pairing

Theoretical work by British physicist Neil Ashcroft predicted that solid metallic hydrogen at extremely high pressure (~500 GPa) should become superconducting at approximately room temperature, due to its extremely high speed of sound and expected strong coupling between the conduction electrons and the lattice-vibration phonons.[42]

A team at Harvard University has claimed to make metallic hydrogen and reports a pressure of 495 GPa.[43] Though the exact critical temperature has not yet been determined, weak signs of a possible Meissner effect and changes in magnetic susceptibility at 250 K may have appeared in early magnetometer tests on an original now-lost sample. A French team is working with doughnut shapes rather than planar at the diamond culette tips.[44]

Organic polymers and exciton-mediated pairing

In 1964, William A. Little proposed the possibility of high-temperature superconductivity in organic polymers.[45]

Other hydrides

In 2004, Ashcroft returned to his idea and suggested that hydrogen-rich compounds can become metallic and superconducting at lower pressures than hydrogen. More specifically, he proposed a novel way to pre-compress hydrogen chemically by examining IVa hydrides.[46]

In 2014–2015, conventional superconductivity was observed in a sulfur hydride system (H2S or H3S) at 190K to 203K at pressures of up to 200 GPa.

In 2016, research suggested a link between palladium hydride containing small impurities of sulfur nanoparticles as a plausible explanation for the anomalous transient resistance drops seen during some experiments, and hydrogen absorption by cuprates was suggested in light of the 2015 results in H2S as a plausible explanation for transient resistance drops or "USO" noticed in the 1990s by Chu et al. during research after the discovery of YBCO.[citation needed][47]

It has been predicted that ScH12 (scandium dodedecahydride) would exhibit superconductivity at room temperature – Tc between 333 K (60 °C) and 398 K (125 °C) – under a pressure expected not to exceed 100 GPa.[48]

Some research efforts are currently moving towards ternary superhydrides, where it has been predicted that Li2MgH16 (bilithium magnesium hexadecahydride) would have a Tc of 473 K (200 °C) at 250 GPa.[49][50]

Spin coupling

It is also possible that if the bipolaron explanation is correct, a normally semiconducting material can transition under some conditions into a superconductor if a critical level of alternating spin coupling in a single plane within the lattice is exceeded; this may have been documented in very early experiments from 1986. The best analogy here would be anisotropic magnetoresistance, but in this case the outcome is a drop to zero rather than a decrease within a very narrow temperature range for the compounds tested similar to "re-entrant superconductivity".[citation needed]

In 2018, support was found for electrons having anomalous 3/2 spin states in YPtBi.[51] Though YPtBi is a relatively low temperature superconductor, this does suggest another approach to creating superconductors.

References

  1. ↑ 1.0 1.1 Somayazulu, Maddury; Ahart, Muhtar; Mishra, Ajay Kumar; Geballe, Zachary M.; Baldini, Maria; Meng, Yue; Struzhkin, Viktor V.; Hemley, Russell Julian (2019). "Evidence for Superconductivity above 260K in Lanthanum Superhydride at Megabar Pressures". Phys. Rev. Lett. 122 (2): 027001. doi:10.1103/PhysRevLett.122.027001. PMID 30720326. Bibcode: 2019PhRvL.122b7001S. 
  2. ↑ 2.0 2.1 Drozdov, Alexander P.; Kong, Panpan; Minkov, Vasily S.; Besedin, Stanislav P.; Kuzovnikov, Mikhail A.; Mozaffari, Shirin; Balicas, Luis; Balakirev, Fedor F. et al. (2019). "Superconductivity at 250 K in lanthanum hydride under high pressures". Nature 569 (7757): 528–531. doi:10.1038/s41586-019-1201-8. PMID 31118520. Bibcode: 2019Natur.569..528D. 
  3. ↑ Dai, Pengcheng; Chakoumakos, Bryan C.; Sun, G.F.; Wong, Kai Wai; Xin, Ying; Lu, D.F. (1995). "Synthesis and neutron powder diffraction study of the superconductor HgBa2Ca2Cu3O8+δ by Tl substitution". Physica C 243 (3–4): 201–206. doi:10.1016/0921-4534(94)02461-8. Bibcode: 1995PhyC..243..201D. 
  4. ↑ Geballe, Theodore Henry (12 March 1993). "Paths to Higher Temperature Superconductors". Science 259 (5101): 1550–1551. doi:10.1126/science.259.5101.1550. PMID 17733017. Bibcode: 1993Sci...259.1550G. 
  5. ↑ 5.0 5.1 Jones, Barbara A.; Roche, Kevin P. (25 July 2016). "Almaden Institute 2012: Superconductivity 297 K – Synthetic Routes to Room Temperature Superconductivity". researcher.watson.ibm.com. https://researcher.watson.ibm.com/researcher/view_project.php?id=3702. 
  6. ↑ NOVA. Race for the Superconductor. Public TV station WGBH Boston. Approximately 1987.
  7. ↑ Garisto, Dan (July 27, 2023). "Viral New Superconductivity Claims Leave Many Scientists Skeptical" (in en). https://www.scientificamerican.com/article/viral-new-superconductivity-claims-leave-many-scientists-skeptical/. 
  8. ↑ Mankowsky, Roman; Subedi, Alaska; Först, Michael; Mariager, Simon O.; Chollet, Matthieu; Lemke, Henrik T.; Robinson, Joseph Stephen; Glownia, James M. et al. (2014). "Nonlinear lattice dynamics as a basis for enhanced superconductivity in YBa2Cu3O6.5". Nature 516 (7529): 71–73. doi:10.1038/nature13875. PMID 25471882. Bibcode: 2014Natur.516...71M. 
  9. ↑ Drozdov, A. P.; Eremets, M. I.; Troyan, I. A.; Ksenofontov, V.; Shylin, S. I. (2015). "Conventional superconductivity at 203 kelvin at high pressures in the sulfur hydride system" (in en). Nature 525 (7567): 73–76. doi:10.1038/nature14964. ISSN 0028-0836. PMID 26280333. Bibcode: 2015Natur.525...73D. http://www.nature.com/articles/nature14964. Retrieved 9 June 2021. 
  10. ↑ Cartlidge, Edwin (18 August 2015). "Superconductivity record sparks wave of follow-up physics". Nature 524 (7565): 277. doi:10.1038/nature.2015.18191. PMID 26289188. Bibcode: 2015Natur.524..277C. 
  11. ↑ Ge, Yanfeng; Zhang, Fan; Yao, Yugui (2016). "First-principles demonstration of superconductivity at 280 K (7 °C) in hydrogen sulfide with low phosphorus substitution". Phys. Rev. B 93 (22): 224513. doi:10.1103/PhysRevB.93.224513. Bibcode: 2016PhRvB..93v4513G. https://zenodo.org/record/1042765. Retrieved 6 November 2017. 
  12. ↑ Grant, Andrew (23 August 2018). "Pressurized superconductors approach room-temperature realm". Physics Today. doi:10.1063/PT.6.1.20180823b. 
  13. ↑ Prins, Johan F. (1 March 2003). "The diamond vacuum interface: II. Electron extraction from n-type diamond: evidence for superconduction at room temperature". Semiconductor Science and Technology 18 (3): S131–S140. doi:10.1088/0268-1242/18/3/319. Bibcode: 2003SeScT..18S.131P. 
  14. ↑ Tripodi, Paolo; Di Gioacchino, Daniele; Borelli, Rodolfo; Vinko, Jenny Darja (May 2003). "Possibility of high temperature superconducting phases in PdH". Physica C: Superconductivity 388–389: 571–572. doi:10.1016/S0921-4534(02)02745-4. Bibcode: 2003PhyC..388..571T. 
  15. ↑ Tripodi, Paolo; Di Gioacchino, Daniele; Vinko, Jenny Darja (August 2004). "Superconductivity in PdH: Phenomenological explanation". Physica C: Superconductivity 408–410: 350–352. doi:10.1016/j.physc.2004.02.099. Bibcode: 2004PhyC..408..350T. 
  16. ↑ Tripodi, Paolo; Di Gioacchino, Daniele; Vinko, Jenny Darja (2007). "A review of high temperature superconducting property of PdH system". International Journal of Modern Physics B 21 (18&19): 3343–3347. doi:10.1142/S0217979207044524. Bibcode: 2007IJMPB..21.3343T. 
  17. ↑ "A material that is superconductive at room temperature and lower pressure". https://phys.org/news/2021-03-material-superconductive-room-temperature-pressure.html. 
  18. ↑ Lee, Sukbae; Kim, Ji-Hoon; Kwon, Young-Wan (2023). "The First Room-Temperature Ambient-Pressure Superconductor". arXiv:2307.12008 [cond-mat.supr-con].
  19. ↑ Lee, Sukbae; Kim, Jihoon; Kim, Hyun-Tak; Im, Sungyeon; An, SooMin; Keun Ho Auh (2023). "Superconductor Pb10−xCux(PO4)6O showing levitation at room temperature and atmospheric pressure and mechanism". arXiv:2307.12037 [cond-mat.supr-con].
  20. ↑ Lee, Sukbae; Kim, Jihoon; Im, Sungyeon; An, Soomin; Kwon, Young-Wan; Ho, Auh Keun (April 2023). "다음논문 Consideration for the development of room-temperature ambient-pressure superconductor (LK-99)". Journal of the Korean Crystal Growth and Crystal Technology 33 (2): 61–70. http://journal.kci.go.kr/jkcgct/archive/articleView?artiId=ART002955269. Retrieved 26 July 2023. 
  21. ↑ "Room temperature and normal pressure superconducting ceramic compound, and method for manufacturing same". https://patents.google.com/patent/WO2023027536A1/en?oq=WO2023027536A1. 
  22. ↑ Padavic-Callaghn, Karmela (26 July 2023). "Room-temperature superconductor 'breakthrough' met with scepticism". New Scientist. https://www.newscientist.com/article/2384782-room-temperature-superconductor-breakthrough-met-with-scepticism. Retrieved 26 July 2023. 
  23. ↑ Johnson, Carolyn (August 9, 2023). "A superconductor claim blew up online. Science has punctured it.". The Washington Post. https://www.washingtonpost.com/science/2023/08/09/room-temperature-superconductor-lk99-evidence/. 
  24. ↑ Orf, Darren (Aug 9, 2023). "Well, Seems Like LK-99 Isn't a Room Temperature Superconductor After All". Popular Mechanics. https://www.popularmechanics.com/science/green-tech/a44764458/lk-99-not-a-superconductor/. Retrieved 2023-08-09. 
  25. ↑ Scheike, Thomas; Böhlmann, Winfried; Esquinazi, Pablo; Barzola-Quiquia, José; Ballestar, Ana; Setzer, Annette (2012). "Can Doping Graphite Trigger Room Temperature Superconductivity? Evidence for Granular High-Temperature Superconductivity in Water-Treated Graphite Powder". Advanced Materials 24 (43): 5826–5831. doi:10.1002/adma.201202219. PMID 22949348. Bibcode: 2012AdM....24.5826S. 
  26. ↑ Thapa, Dev Kumar; Pandey, Anshu (2018). "Evidence for superconductivity at ambient temperature and pressure in nanostructures". arXiv:1807.08572 [cond-mat.supr-con].
  27. ↑ Desikan, Shubashree (18 August 2018). "IISc duo's claim of ambient superconductivity may have support in theory". The Hindu. https://www.thehindu.com/sci-tech/science/iisc-duos-claim-of-ambient-superconductivity-may-have-support-in-theory/article24725793.ece. 
  28. ↑ Prasad, R.; Desikan, Shubashree (25 May 2019). "Finally, IISc team confirms breakthrough in superconductivity at room temperature". The Hindu. https://www.thehindu.com/sci-tech/science/finally-iisc-team-confirms-superconductivity-at-room-temperature-pressure/article27246496.ece. 
  29. ↑ Garisto, Dan (2023-03-09). "Allegations of Scientific Misconduct Mount as Physicist Makes His Biggest Claim Yet" (in en). Physics 16: 40. doi:10.1103/Physics.16.40. Bibcode: 2023PhyOJ..16...40G. https://physics.aps.org/articles/v16/40. Retrieved 21 March 2023. 
  30. ↑ Chang, Kenneth (October 14, 2020). "Finally, the First Room-Temperature Superconductor". The New York Times. https://www.nytimes.com/2020/10/14/science/superconductor-room-temperature.html. 
  31. ↑ Snider, Elliot; Dasenbrock-Gammon, Nathan; McBride, Raymond; Debessai, Mathew; Vindana, Hiranya; Vencatasamy, Kevin; Lawler, Keith V.; Salamat, Ashkan et al. (October 2020). "Room-temperature superconductivity in a carbonaceous sulfur hydride". Nature 586 (7829): 373–377. doi:10.1038/s41586-020-2801-z. PMID 33057222. Bibcode: 2020Natur.586..373S. 
  32. ↑ Hand, Eric (September 26, 2022). "'Something is Seriously Wrong':Room-Temperature superconductivity study retracted". Science. https://www.science.org/content/article/something-seriously-wrong-room-temperature-superconductivity-study-retracted. 
  33. ↑ Dasenbrock-Gammon, Nathan; Snider, Elliot; McBride, Raymond; Pasan, Hiranya; Durkee, Dylan; Khalvashi-Sutter, Nugzari; Munasinghe, Sasanka; Dissanayake, Sachith E. et al. (9 March 2023). "Evidence of near-ambient superconductivity in a N-doped lutetium hydride". Nature 615 (7951): 244–250. doi:10.1038/s41586-023-05742-0. PMID 36890373. Bibcode: 2023Natur.615..244D. https://www.nature.com/articles/s41586-023-05742-0. Retrieved 8 March 2023. 
  34. ↑ Woodward, Aylin (8 March 2023). "The Scientific Breakthrough That Could Make Batteries Last Longer". Wall Street Journal. https://www.wsj.com/articles/superconductor-breakthrough-energy-reddmatter-90dfa165. 
  35. ↑ "'Revolutionary' blue crystal resurrects hope of room temperature superconductivity". https://www.science.org/content/article/revolutionary-blue-crystal-resurrects-hope-room-temperature-superconductivity. 
  36. ↑ Anderson, Margo (March 8, 2023). "Room-Temperature Superconductivity Claimed". Institute of Electrical and Electronics Engineers. https://spectrum.ieee.org/room-temperature-superconductor. 
  37. ↑ Wood, Charlie; Savitsky, Zack (8 March 2023). "Room-Temperature Superconductor Discovery Meets With Resistance". Simons Foundation. https://www.quantamagazine.org/room-temperature-superconductor-discovery-meets-with-resistance-20230308/. 
  38. ↑ Garisto, Dan (2023-03-09). "Allegations of Scientific Misconduct Mount as Physicist Makes His Biggest Claim Yet" (in en). Physics 16: 40. doi:10.1103/Physics.16.40. Bibcode: 2023PhyOJ..16...40G. https://physics.aps.org/articles/v16/40. 
  39. ↑ Yirka, Bob (17 May 2023). "Replication of room-temperature superconductor claims fails to show superconductivity". https://phys.org/news/2023-05-replication-room-temperature-superconductor-superconductivity.amp. 
  40. ↑ Wilkins, Alex (17 March 2023). "'Red matter' superconductor may not be a wonder material after all" (in en-US). https://www.newscientist.com/article/2364955-red-matter-superconductor-may-not-be-a-wonder-material-after-all/. 
  41. ↑ Salke, Nilesh P.; Mark, Alexander C.; Ahart, Muhtar; Hemley, Russell J. (2023-06-09). "Evidence for Near Ambient Superconductivity in the Lu-N-H System". arXiv:2306.06301 [cond-mat].
  42. ↑ Ashcroft, N. W. (1968). "Metallic Hydrogen: A High-Temperature Superconductor?". Physical Review Letters 21 (26): 1748–1749. doi:10.1103/PhysRevLett.21.1748. Bibcode: 1968PhRvL..21.1748A. 
  43. ↑ Johnston, Ian (26 January 2017). "Hydrogen turned into metal in stunning act of alchemy that could revolutionise technology and spaceflight" (in en-UK). The Independent. https://www.independent.co.uk/news/science/hydrogen-metal-revolution-technology-space-rockets-superconductor-harvard-university-a7548221.html. 
  44. ↑ Loubeyre, Paul; Occelli, Florent; Dumas, Paul (2019). "Observation of a first order phase transition to metal hydrogen near 425 GPa". arXiv:1906.05634 [cond-mat.mtrl-sci].
  45. ↑ Little, W. A. (1964). "Possibility of Synthesizing an Organic Superconductor". Physical Review 134 (6A): A1416–A1424. doi:10.1103/PhysRev.134.A1416. Bibcode: 1964PhRv..134.1416L. 
  46. ↑ Ashcroft, N. W. (2004). "Hydrogen Dominant Metallic Alloys: High Temperature superconductors". Physical Review Letters 92 (18): 1748–1749. doi:10.1103/PhysRevLett.92.187002. PMID 15169525. Bibcode: 2004PhRvL..92r7002A. 
  47. ↑ Transient High-Temperature Superconductivity in Palladium Hydride. Griffith University (Griffith thesis). Griffith University. 2016. Archived from the original on 6 August 2020. Retrieved 2 December 2019.
  48. ↑ Jiang, Qiwen; Duan, Defang; Song, Hao; Zhang, Zihan; Huo, Zihao; Cui, Tian; Yao, Yansun (2023-02-06). "Room temperature superconductivity in ScH12 with quasi-atomic hydrogen below megabar pressure". arXiv:2302.02621 [cond-mat.supr-con].
  49. ↑ Sun, Ying; Lv, Jian; Xie, Yu; Liu, Hanyu; Ma, Yanming (August 26, 2019). "Route to a Superconducting Phase above Room Temperature in Electron-Doped Hydride Compounds under High Pressure". Physical Review Letters 123 (9): 097001. doi:10.1103/PhysRevLett.123.097001. PMID 31524448. Bibcode: 2019PhRvL.123i7001S. https://physics.aps.org/featured-article-pdf/10.1103/PhysRevLett.123.097001. Retrieved 9 January 2022. "The recent theory-orientated discovery of record high-temperature superconductivity (Tc~250 K) in sodalitelike clathrate LaH10 is an important advance toward room-temperature superconductors. Here, we identify an alternative clathrate structure in ternary Li2MgH16 with a remarkably high estimated Tc of ~473 K at 250 GPa, which may allow us to obtain room-temperature or even higher-temperature superconductivity.". 
  50. ↑ Extance, Andy (November 1, 2019). "The race is on to make the first room temperature superconductor". Royal Society of Chemistry. https://www.chemistryworld.com/news/the-race-is-on-to-make-the-first-room-temperature-superconductor/4010591.article. "In August, Ma and colleagues published a study that showed the promise of ternary superhydrides. They predicted that Li2MgH16 would have a Tc of 473 K at 250 GPa, far in excess of room temperature." 
  51. ↑ MacDonald, Fiona (9 April 2018). "Physicists Just Discovered an Entirely New Type of Superconductivity". ScienceAlert. https://www.sciencealert.com/brand-new-type-of-superconductor-discovered-physics. 



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