Room-temperature superconductor

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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 infeasible. [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 H
2 S transitioned to a superconductive form H
3 S 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 ( LaH
10) 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 1993 and 1997, Michel Laguës and his team published evidence of room temperature superconductivity observed on MBE deposited ultrathin nanostructures of BiSrCaCuO. [13] [14] These compounds exhibit extremely low resistivities orders of magnitude below that of copper, strongly non-linear I(V) characteristics and hysteretic I(V) behavior.

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. [15]

In 2003, a group of researchers published results on high-temperature superconductivity in palladium hydride (PdHx: x > 1) [16] and an explanation in 2004. [17] In 2007, the same group published results suggesting a superconducting transition temperature of 260 K, [18] 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. [19]

On July 23, 2023, a Korean team claimed that Cu-doped lead apatite, which they named LK-99, was superconducting up to 370 K, though they had not observed this fully. [20] They posted two preprints to arXiv, [21] published a paper in a journal, [22] and submitted a patent application. [23] The reported observations were received with skepticism by experts due to the lack of clear signatures of superconductivity. [24] 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. [25] [26]

On 31st of December 2023 "Global Room-Temperature Superconductivity in Graphite" was published in the journal "Advanced Quantum Technologies" claiming to demonstrate superconductivity at room temperature and ambient pressure in Highly oriented pyrolytic graphite with dense arrays of nearly parallel line defects. [27]

Retracted or unreliable studies

A magnet levitating above a superconductor (at -200 degC) that is exhibiting the Meissner effect. Magnet 4.jpg
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. [28] [ unreliable source? ] 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. [29] Due to similar noise patterns of supposedly independent plots and the publication's lack of peer review, the results have been called into question. [30] Although the researchers repeated their findings in a later paper in 2019, [31] 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. [32] 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. [33] [34] This was retracted in 2022 after flaws in their statistical methods were identified and led to questioning of other data. [35] [36] [37] [38] [39] [40] 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. [41] The lutetium hydride paper is also being reviewed for retraction.[ citation needed ] The first attempts to replicate those results failed. [42] [43] [44]

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. [45]

A team at Harvard University has claimed to make metallic hydrogen and reports a pressure of 495 GPa. [46] 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. [47]

Organic polymers and exciton-mediated pairing

In 1964, William A. Little proposed the possibility of high-temperature superconductivity in organic polymers. [48]

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. [49]

In 2014–2015, conventional superconductivity was observed in a sulfur hydride system (H
2S or H
3S) at 190 K to 203 K 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 H
2S 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 ] [50]

It has been predicted that ScH
12 (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. [51]

Some research efforts are currently moving towards ternary superhydrides, where it has been predicted that Li
2MgH
16 (bilithium magnesium hexadecahydride) would have a Tc of 473 K (200 °C) at 250 GPa. [52] [53]

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. [54] Though YPtBi is a relatively low temperature superconductor, this does suggest another approach to creating superconductors.

Related Research Articles

<span class="mw-page-title-main">Superconductivity</span> Electrical conductivity with exactly zero resistance

Superconductivity is a set of physical properties observed in certain materials where electrical resistance vanishes and magnetic fields are expelled from the material. Any material exhibiting these properties is a superconductor. Unlike an ordinary metallic conductor, whose resistance decreases gradually as its temperature is lowered, even down to near absolute zero, a superconductor has a characteristic critical temperature below which the resistance drops abruptly to zero. An electric current through a loop of superconducting wire can persist indefinitely with no power source.

Unconventional superconductors are materials that display superconductivity which does not conform to conventional BCS theory or its extensions.

<span class="mw-page-title-main">High-temperature superconductivity</span> Superconductive behavior at temperatures much higher than absolute zero

High-temperature superconductors are defined as materials with critical temperature above 77 K, the boiling point of liquid nitrogen. They are only "high-temperature" relative to previously known superconductors, which function at even colder temperatures, close to absolute zero. The "high temperatures" are still far below ambient, and therefore require cooling. The first break through of high-temperature superconductor was discovered in 1986 by IBM researchers Georg Bednorz and K. Alex Müller. Although the critical temperature is around 35.1 K, this new type of superconductor was readily modified by Ching-Wu Chu to make the first high-temperature superconductor with critical temperature 93 K. Bednorz and Müller were awarded the Nobel Prize in Physics in 1987 "for their important break-through in the discovery of superconductivity in ceramic materials". Most high-Tc materials are type-II superconductors.

Metallic hydrogen is a phase of hydrogen in which it behaves like an electrical conductor. This phase was predicted in 1935 on theoretical grounds by Eugene Wigner and Hillard Bell Huntington.

Cuprate superconductors are a family of high-temperature superconducting materials made of layers of copper oxides (CuO2) alternating with layers of other metal oxides, which act as charge reservoirs. At ambient pressure, cuprate superconductors are the highest temperature superconductors known. However, the mechanism by which superconductivity occurs is still not understood.

<span class="mw-page-title-main">Iron-based superconductor</span>

Iron-based superconductors (FeSC) are iron-containing chemical compounds whose superconducting properties were discovered in 2006. In 2008, led by recently discovered iron pnictide compounds, they were in the first stages of experimentation and implementation..

<span class="mw-page-title-main">Covalent superconductor</span> Superconducting materials where the atoms are linked by covalent bonds

Covalent superconductors are superconducting materials where the atoms are linked by covalent bonds. The first such material was boron-doped synthetic diamond grown by the high-pressure high-temperature (HPHT) method. The discovery had no practical importance, but surprised most scientists as superconductivity had not been observed in covalent semiconductors, including diamond and silicon.

<span class="mw-page-title-main">122 iron arsenide</span>

The 122 iron arsenide unconventional superconductors are part of a new class of iron-based superconductors. They form in the tetragonal I4/mmm, ThCr2Si2 type, crystal structure. The shorthand name "122" comes from their stoichiometry; the 122s have the chemical formula AEFe2Pn2, where AE stands for alkaline earth metal (Ca, Ba Sr or Eu) and Pn is pnictide (As, P, etc.). These materials become superconducting under pressure and also upon doping. The maximum superconducting transition temperature found to date is 38 K in the Ba0.6K0.4Fe2As2. The microscopic description of superconductivity in the 122s is yet unclear.

Heavy fermion superconductors are a type of unconventional superconductor.

CeCoIn5 ("Cerium-Cobalt-Indium 5") is a heavy-fermion superconductor with a layered crystal structure, with somewhat two-dimensional electronic transport properties. The critical temperature of 2.3 K is the highest among all of the Ce-based heavy-fermion superconductors.

Yttrium hydride is a compound of hydrogen and yttrium. It is considered to be a part of the class of rare-earth metal hydrides. It exists in several forms, the most common being a metallic compound with formula YH2. YH2 has a face-centred cubic structure, and is a metallic compound. Under great pressure, extra hydrogen can combine to yield an insulator with a hexagonal structure, with a formula close to YH3. Hexagonal YH3 has a band gap of 2.6 eV. Under pressure of 12 GPa YH3 transforms to an intermediate state, and when the pressure increases to 22 GPa another metallic face-centred cubic phase is formed.

Russell Julian Hemley is an American geophysicist, solid-state physicist, and physical chemist. Hemley is especially notable for his work in the theoretical prediction and experimental observation of near room-temperature superconductivity in lanthanum decahydride under high pressure.

A polyhydride or superhydride is a compound that contains an abnormally large amount of hydrogen. This can be described as high hydrogen stoichiometry. Examples include iron pentahydride FeH5, LiH6, and LiH7. By contrast, the more well known lithium hydride only has one hydrogen atom.

<span class="mw-page-title-main">Fulleride</span> Chemical compound

Fullerides are chemical compounds containing fullerene anions. Common fullerides are derivatives of the most common fullerenes, i.e. C60 and C70. The scope of the area is large because multiple charges are possible, i.e., [C60]n− (n = 1, 2...6), and all fullerenes can be converted to fullerides. The suffix "-ide" implies their negatively charged nature.

Lanthanum decahydride is a polyhydride or superhydride compound of lanthanum and hydrogen (LaH10) that has shown evidence of being a high-temperature superconductor. It was the first metal superhydride to be theoretically predicted, synthesized, and experimentally confirmed to superconduct at near room-temperatures. It has a superconducting transition temperature TC around 250 K (−23 °C; −10 °F) at a pressure of 150 gigapascals (22×10^6 psi), and its synthesis required pressures above approximately 160 gigapascals (23×10^6 psi).

In chemistry, a hydridonitride is a chemical compound that contains hydride and nitride ions in a single phase. These inorganic compounds are distinct from inorganic amides and imides as the hydrogen does not share a bond with nitrogen, and contain a larger proportion of metals.

Carbonaceous sulfur hydride (CSH) is a potential superconductor that was announced in October 2020 by the lab of Ranga Dias at the University of Rochester, in a Nature paper that was later retracted. It was reported to have a superconducting transition temperature of 15 °C (59 °F) at a pressure of 267 gigapascals (GPa), which would have made it the highest-temperature superconductor discovered. The paper faced criticism dut to its non-standard data analysis calling into question its conclusions, and in September 2022 it was retracted by Nature. In July 2023 a second paper by the authors was retracted from Physical Review Letters due to suspected data fabrication, and in September 2023 a third paper by the authors about N-doped lutetium hydride was retracted from Nature.

Ranga P. Dias is a researcher and academic who specializes in condensed matter physics. He is an assistant professor in the departments of Mechanical Engineering and Physics and Astronomy at the University of Rochester (UR), and a scientist at the UR Laboratory for Laser Energetics.

<span class="mw-page-title-main">LK-99</span> Proposed superconducting material

LK-99, also called PCPOSOS, is a gray–black, polycrystalline compound, identified as a copper-doped lead‒oxyapatite. A team from Korea University led by Lee Sukbae (이석배) and Kim Ji-Hoon (김지훈) began studying this material as a potential superconductor starting in 1999. In July 2023, they published preprints claiming that it acts as a room-temperature superconductor at temperatures of up to 400 K at ambient pressure.

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  48. ↑ Little, W. A. (1964). "Possibility of Synthesizing an Organic Superconductor". Physical Review. 134 (6A): A1416–A1424. Bibcode:1964PhRv..134.1416L. doi:10.1103/PhysRev.134.A1416.
  49. ↑ Ashcroft, N. W. (2004). "Hydrogen Dominant Metallic Alloys: High Temperature superconductors". Physical Review Letters . 92 (18): 1748–1749. Bibcode:2004PhRvL..92r7002A. doi:10.1103/PhysRevLett.92.187002. PMID   15169525.
  50. ↑ 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.
  51. ↑ Jiang, Qiwen; Duan, Defang; Song, Hao; Zhang, Zihan; Huo, Zihao; Cui, Tian; Yao, Yansun (6 February 2023). "Room temperature superconductivity in ScH12 with quasi-atomic hydrogen below megabar pressure". arXiv: 2302.02621 [cond-mat.supr-con].
  52. ↑ Sun, Ying; Lv, Jian; Xie, Yu; Liu, Hanyu; Ma, Yanming (26 August 2019). "Route to a Superconducting Phase above Room Temperature in Electron-Doped Hydride Compounds under High Pressure". Physical Review Letters. 123 (9): 097001. Bibcode:2019PhRvL.123i7001S. doi:10.1103/PhysRevLett.123.097001. PMID   31524448. S2CID   202123043. Archived from the original on 26 November 2020. 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 Li
    2    MgH
    16     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.
  53. ↑ Extance, Andy (1 November 2019). "The race is on to make the first room temperature superconductor". www.chemistryworld.com. Royal Society of Chemistry. Archived from the original on 30 December 2019. Retrieved 30 December 2019. In August, Ma and colleagues published a study that showed the promise of ternary superhydrides. They predicted that Li
    2     MgH
    16     would have a Tc of 473  K at 250 GPa, far in excess of room temperature.
  54. ↑ MacDonald, Fiona (9 April 2018). "Physicists Just Discovered an Entirely New Type of Superconductivity". ScienceAlert. Archived from the original on 7 February 2019. Retrieved 6 February 2019.
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