Universal Fermi velocity in highly compressed hydride superconductors

Talantsev Evgeny F.

doi:10.1063/5.0091446

Volume 7 Issue 5

Sep. 2022

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Talantsev Evgeny F.. Universal Fermi velocity in highly compressed hydride superconductors[J]. Matter and Radiation at Extremes, 2022, 7(5): 058403. doi: 10.1063/5.0091446

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Talantsev Evgeny F.. Universal Fermi velocity in highly compressed hydride superconductors[J]. Matter and Radiation at Extremes, 2022, 7(5): 058403. doi: 10.1063/5.0091446

Talantsev Evgeny F.. Universal Fermi velocity in highly compressed hydride superconductors[J]. Matter and Radiation at Extremes, 2022, 7(5): 058403. doi: 10.1063/5.0091446

Citation:

Talantsev Evgeny F.. Universal Fermi velocity in highly compressed hydride superconductors[J]. Matter and Radiation at Extremes, 2022, 7(5): 058403. doi: 10.1063/5.0091446

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Universal Fermi velocity in highly compressed hydride superconductors

doi: 10.1063/5.0091446

Talantsev Evgeny F.^{,
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M. N. Miheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, 18, S. Kovalevskoy St., Ekaterinburg 620108, Russia and NANOTECH Centre, Ural Federal University, 19 Mira St., Ekaterinburg 620002, Russia

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Corresponding author: a)Author to whom correspondence should be addressed: evgney.talantsev@imp.uran.ru
Received Date: 2022-03-15
Accepted Date: 2022-07-22

Available Online: 2022-09-01

Publish Date: 2022-09-01

Abstract

Abstract

The Fermi velocity v_F is one of the primary characteristics of any conductor, including any superconductor. For conductors at ambient pressure, several experimental techniques have been developed to measure v_F, and, for instance, Zhou et al. [Nature 423 , 398 (2003)] reported that high-T_c cuprates exhibited a universal nodal Fermi velocity vF,univ=2.7±0.5×105 m/s. However, there have been no measurements of v_F in highly compressed near-room-temperature superconductors (NRTS), owing to experimental challenges. Here, to answer the question of the existence of a universal Fermi velocity in NRTS materials, we analyze the full inventory of data on the ground-state upper critical field B_c2(0) for these materials and find that this class of superconductors exhibits a universal Fermi velocity vF,univ=1/1.3×2Δ0/kBTc×105 m/s, where Δ(0) is the ground-state amplitude of the energy gap. The ratio 2Δ0/kBTc varies within a narrow range 3.2≤2Δ0/kBTc≤5, and so v_F,univ in NRTS materials lies in the range 2.5 × 10⁵ m/s ≤ v_F,univ ≤ 3.8 × 10⁵ m/s, which is similar to the range of values found for the high-T_c cuprate counterparts of these materials.

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References(108)

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