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  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., et al. (2019). Superconductivity at 250 K in lanthanum hydride under high pressures. Nature, 569, 528-531. doi:10.1038/s41586-019-1201-8.

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 Creators:
Drozdov, A. P.1, Author              
Kong, P. P.1, Author              
Minkov, V. S.1, Author              
Besedin, S. P.1, Author              
Kuzovnikov, M. A.1, Author              
Mozaffari, S., Author
Balicas, L., Author
Balakirev, F. F., Author
Graf, D. E., Author
Prakapenka, V. B., Author
Greenberg, E., Author
Knyazev, D. A.1, Author              
Tkacz, M., Author
Eremets, M. I.1, Author              
Affiliations:
1High Pressure Group, Max Planck Institute for Chemistry, Max Planck Society, ou_1826289              

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 Abstract: 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 atoms2,3,4. For LaH10 and YH10, the onset of superconductivity is predicted to occur at critical temperatures between 240 and 320 kelvin at megabar pressures3,4,5,6. Here we report superconductivity with a critical temperature of around 250 kelvin within the Fm3¯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. The increase of around 50 kelvin compared with the previous highest critical temperature1 is an encouraging step towards the goal of achieving room-temperature superconductivity in the near future.

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Language(s): eng - English
 Dates: 2019
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1038/s41586-019-1201-8
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Title: Nature
  Abbreviation : Nature
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 569 Sequence Number: - Start / End Page: 528 - 531 Identifier: ISSN: 0028-0836
CoNE: https://pure.mpg.de/cone/journals/resource/954925427238