Affiliation:
1. 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
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 [Formula: see text] 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 [Formula: see text] m/s, where Δ(0) is the ground-state amplitude of the energy gap. The ratio [Formula: see text] varies within a narrow range [Formula: see text], 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- Tc cuprate counterparts of these materials.
Funder
Ministry of Science and Higher Education of the Russian Federation
Subject
Electrical and Electronic Engineering,Nuclear Energy and Engineering,Nuclear and High Energy Physics,Atomic and Molecular Physics, and Optics
Cited by
5 articles.
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