High-temperature superconductivity on the verge of a structural instability in lanthanum superhydride

Sun, Dan; Minkov, Vasily S.; Mozaffari, Shirin; Sun, Ying; Ma, Yanming; Chariton, Stella; Prakapenka, Vitali B.; Eremets, Mikhail I.; Balicas, Luis; Balakirev, Fedor F.

doi:10.1038/s41467-021-26706-w

Title: High-temperature superconductivity on the verge of a structural instability in lanthanum superhydride

Abstract

The possibility of high, room-temperature superconductivity was predicted for metallic hydrogen in the 1960s. However, metallization and superconductivity of hydrogen are yet to be unambiguously demonstrated and may require pressures as high as 5 million atmospheres. Rare earth based “superhydrides”, such as LaH₁₀, can be considered as a close approximation of metallic hydrogen even though they form at moderately lower pressures. In superhydrides the predominance of H-H metallic bonds and high superconducting transition temperatures bear the hallmarks of metallic hydrogen. Still, experimental studies revealing the key factors controlling their superconductivity are scarce. Here, we report the pressure and magnetic field dependence of the superconducting order observed in LaH₁₀. We determine that the high-symmetry high-temperature superconducting Fm-3m phase of LaH₁₀ can be stabilized at substantially lower pressures than previously thought. We find a remarkable correlation between superconductivity and a structural instability indicating that lattice vibrations, responsible for the monoclinic structural distortions in LaH₁₀, strongly affect the superconducting coupling.

Authors:

;

; Mozaffari, Shirin;

;

; Chariton, Stella;

;

Publication Date:: Thu Nov 25 00:00:00 EST 2021

Research Org.:: Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

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

OSTI Identifier:: 1832614

Alternate Identifier(s):: OSTI ID: 1832532; OSTI ID: 1870630

Report Number(s):: LA-UR-20-26958
Journal ID: ISSN 2041-1723; 6863; PII: 26706

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

Resource Type:: Published Article

Journal Name:: Nature Communications

Additional Journal Information:: Journal Name: Nature Communications Journal Volume: 12 Journal Issue: 1; Journal ID: ISSN 2041-1723

Publisher:: Nature Publishing Group

Country of Publication:: United Kingdom

Language:: English

Subject:: 36 MATERIALS SCIENCE; High Temperature Superconductivity; superhydrides; electron-phonon coupling

Citation Formats


                    Sun, Dan, Minkov, Vasily S., Mozaffari, Shirin, Sun, Ying, Ma, Yanming, Chariton, Stella, Prakapenka, Vitali B., Eremets, Mikhail I., Balicas, Luis, and Balakirev, Fedor F. High-temperature superconductivity on the verge of a structural instability in lanthanum superhydride.  United Kingdom: N. p., 2021. 
Web.  doi:10.1038/s41467-021-26706-w.

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                    Sun, Dan, Minkov, Vasily S., Mozaffari, Shirin, Sun, Ying, Ma, Yanming, Chariton, Stella, Prakapenka, Vitali B., Eremets, Mikhail I., Balicas, Luis, & Balakirev, Fedor F. High-temperature superconductivity on the verge of a structural instability in lanthanum superhydride.  United Kingdom.  https://doi.org/10.1038/s41467-021-26706-w

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                    Sun, Dan, Minkov, Vasily S., Mozaffari, Shirin, Sun, Ying, Ma, Yanming, Chariton, Stella, Prakapenka, Vitali B., Eremets, Mikhail I., Balicas, Luis, and Balakirev, Fedor F. Thu .  
"High-temperature superconductivity on the verge of a structural instability in lanthanum superhydride".  United Kingdom.  https://doi.org/10.1038/s41467-021-26706-w.

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@article{osti_1832614,

  title        = {High-temperature superconductivity on the verge of a structural instability in lanthanum superhydride},

  author       = {Sun, Dan and Minkov, Vasily S. and Mozaffari, Shirin and Sun, Ying and Ma, Yanming and Chariton, Stella and Prakapenka, Vitali B. and Eremets, Mikhail I. and Balicas, Luis and Balakirev, Fedor F.},

  abstractNote = {The possibility of high, room-temperature superconductivity was predicted for metallic hydrogen in the 1960s. However, metallization and superconductivity of hydrogen are yet to be unambiguously demonstrated and may require pressures as high as 5 million atmospheres. Rare earth based “superhydrides”, such as LaH10, can be considered as a close approximation of metallic hydrogen even though they form at moderately lower pressures. In superhydrides the predominance of H-H metallic bonds and high superconducting transition temperatures bear the hallmarks of metallic hydrogen. Still, experimental studies revealing the key factors controlling their superconductivity are scarce. Here, we report the pressure and magnetic field dependence of the superconducting order observed in LaH10. We determine that the high-symmetry high-temperature superconducting Fm-3m phase of LaH10 can be stabilized at substantially lower pressures than previously thought. We find a remarkable correlation between superconductivity and a structural instability indicating that lattice vibrations, responsible for the monoclinic structural distortions in LaH10, strongly affect the superconducting coupling.},

  doi          = {10.1038/s41467-021-26706-w},

  journal      = {Nature Communications},

  number       = 1,

  volume       = 12,

  place        = {United Kingdom},

  year         = {Thu Nov 25 00:00:00 EST 2021},

  month        = {Thu Nov 25 00:00:00 EST 2021}

}

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Title: High-temperature superconductivity on the verge of a structural instability in lanthanum superhydride

Abstract

Citation Formats

The role of the phonon anomaly in the superconductivity of vanadium and selenium under high pressures journal, March 2007

Transition temperature of strong-coupled superconductors reanalyzed journal, August 1975

Superconductivity of Lanthanum Superhydride Investigated Using the Standard Four-Probe Configuration under High Pressures journal, October 2020

Superconductivity of LaH 10 and LaH 16 polyhydrides journal, January 2020

Superconducting phase diagram of H3S under high magnetic fields journal, June 2019

Enhancement of Superconductivity and Evidence of Structural Instability in Intercalated Graphite CaC 6 under High Pressure journal, February 2007

Temperature and Purity Dependence of the Superconducting Critical Field, H c 2 . III. Electron Spin and Spin-Orbit Effects journal, July 1966

Dynamics and superconductivity in compressed lanthanum superhydride journal, September 2018

High-Temperature Superconducting Phases in Cerium Superhydride with a T c up to 115 K below a Pressure of 1 Megabar journal, September 2021

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Room-temperature superconductivity in a carbonaceous sulfur hydride journal, October 2020

QUANTUM ESPRESSO: a modular and open-source software project for quantum simulations of materials journal, September 2009

Reverse‐field reciprocity for conducting specimens in magnetic fields journal, February 1987

Phonon Softening and Superconductivity in Tellurium under Pressure journal, August 1996

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The role of the phonon anomaly in the superconductivity of vanadium and selenium under high pressures
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Transition temperature of strong-coupled superconductors reanalyzed
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Superconductivity of Lanthanum Superhydride Investigated Using the Standard Four-Probe Configuration under High Pressures
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Enhancement of Superconductivity and Evidence of Structural Instability in Intercalated Graphite ${CaC}_{6}$ under High Pressure
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