Superconductivity at 250 K in lanthanum hydride under high pressures

Drozdov, A. P.; Kong, P. P.; Minkov, V. S.; Besedin, S. P.; Kuzovnikov, M. A.; Mozaffari, S.; Balicas, L.; Balakirev, F. F.; Graf, D. E.; Prakapenka, V. B.; Greenberg, E.; Knyazev, D. A.; Tkacz, M.; Eremets, M. I.

doi:10.1038/s41586-019-1201-8

Title: Superconductivity at 250 K in lanthanum hydride under high pressures

Journal Article · Wed May 22 00:00:00 EDT 2019 · Nature (London)

DOI:https://doi.org/10.1038/s41586-019-1201-8· OSTI ID:1594454

Drozdov, A. P. ^[1]; Kong, P. P. ^[1]; Minkov, V. S. ^[1]; Besedin, S. P. ^[1]; Kuzovnikov, M. A. ^[1]; Mozaffari, S. ^[2]; Balicas, L. ^[2]; Balakirev, F. F. ^[3]; Graf, D. E. ^[2]; Prakapenka, V. B. ^[4]; Greenberg, E. ^[4]; Knyazev, D. A. ^[1]; Tkacz, M. ^[5]; Eremets, M. I. ^[1]

Max-Planck Institut für Chemie, Mainz (Germany)
Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Chicago, IL (United States)
Inst. of Physical Chemistry PAS, Warsaw (Poland)

With the discovery of superconductivity at 203 kelvin in H₃S, attention returned to conventional superconductors with properties that can be described by the Bardeen–Cooper–Schrieffer and the Migdal–Eliashberg theories. Although these theories predict the possibility of room-temperature superconductivity in metals that have certain favourable properties—such as lattice vibrations at high frequencies—they are not sufficient to guide the design or predict the properties of new superconducting materials. First-principles calculations based on density functional theory have enabled such predictions, and have suggested a new family of superconducting hydrides that possess a clathrate-like structure in which the host atom (calcium, yttrium, lanthanum) is at the centre of a cage formed by hydrogen atoms. For LaH₁₀ and YH₁₀, the onset of superconductivity is predicted to occur at critical temperatures between 240 and 320 kelvin at megabar pressures. In this work, we report superconductivity with a critical temperature of around 250 kelvin within the Fm$$\bar{3}$$m structure of LaH₁₀ at a pressure of about 170 gigapascals. This is, to our knowledge, the highest critical temperature that has been confirmed so far in a superconducting material. Superconductivity was evidenced by the observation of zero resistance, an isotope effect, and a decrease in critical temperature under an external magnetic field, which suggested an upper critical magnetic field of about 136 tesla at zero temperature. Lastly, the increase of around 50 kelvin compared with the previous highest critical temperature is an encouraging step towards the goal of achieving room-temperature superconductivity in the near future.

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Research Organization:: Florida State Univ., Tallahassee, FL (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: SC0002613; FG02-94ER14466; AC02-06CH11357; DMR-1644779; EAR-1634415; 89233218CNA000001

OSTI ID:: 1594454

Alternate ID(s):: OSTI ID: 1770106

Report Number(s):: LA-UR-19-21534; TRN: US2101806

Journal Information:: Nature (London), Vol. 569, Issue 7757; ISSN 0028-0836

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 599 works

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