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

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- Matter and Radiation at Extremes
- Vol. 7, Issue 5, 058403 (2022)

Fig. 1. Universal nodal Fermi velocity v F , u n i v = 2.7 ± 0.5 × 1 0 5 m/s for cuprate superconductors. These are the raw data reported by Zhou et al. 37 for (La2−x Srx )CuO4 (LSCO), (La2−x −y Ndy Srx )CuO4 (Nd-LSCO), Bi2Sr2CaCu2O8 (Bi-2212), Bi2Sr2CuO6 (Bi-2201), (Ca2−x Nax )CuO2Cl2 (Na-CCOC), and Tl2Ba2CuO6 (Tl-2201).

Fig. 2. Upper critical field data B c 2(T ) and data fit to Eqs. (13) and (14) for unannealed highly compressed sulfur hydride (P = 190 GPa). The raw R (T , B appl) dataset was that reported by Drozdov et al. 1 The deduced values of ξ 0 , Δ 0 , T c , and ΔC /γT c are shown on the figure. The 95% confidence bands are shown by the pink shaded area. The fit quality is R = 0.9985.

Fig. 3. Total B c2(0) vs T c dataset for hydrogen-rich superconductors deduced in this work (Table I ) and data fits to (a) Eq. (7) and (b) Eq. (5) . (a) Free-fitting β = 2.07 ± 0.14 and f = 1.19 ± 0.90 × 1 0 − 10 s2/m2; the fit quality is R = 0.9361. (b) β = 2.0 (fixed) and free-fitting f = 1.68 ± 0.08 × 1 0 − 10 s2/m2; the fit quality is R = 0.9354.
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Table 1. Deduced and Tc values for hydrogen-rich superconductors for which raw R(T, Bappl) data are available to date.

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