Universal Fermi velocity in highly compressed hydride superconductors

Evgeny F. Talantsev

doi:10.1063/5.0091446

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

Universal Fermi velocity in highly compressed hydride superconductors

Evgeny F. Talantsev^a)

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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Fig. 1. Universal nodal Fermi velocity vF,univ=2.7±0.5×105 m/s for cuprate superconductors. These are the raw data reported by Zhou et al.³⁷ for (La_2−xSr_x)CuO₄ (LSCO), (La_2−x−yNd_ySr_x)CuO₄ (Nd-LSCO), Bi₂Sr₂CaCu₂O₈ (Bi-2212), Bi₂Sr₂CuO₆ (Bi-2201), (Ca_2−xNa_x)CuO₂Cl₂ (Na-CCOC), and Tl₂Ba₂CuO₆ (Tl-2201).

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Fig. 2. Upper critical field data B_c2(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 ξ0, Δ0, 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.

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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±0.90×10−10 s²/m²; the fit quality is R = 0.9361. (b) β = 2.0 (fixed) and free-fitting f=1.68±0.08×10−10 s²/m²; the fit quality is R = 0.9354.

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Table 1. Deduced $B_{c 2} (0)$ and T_c values for hydrogen-rich superconductors for which raw R(T, B_appl) data are available to date.

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Table 1. Deduced $B_{c 2} (0)$ and T_c values for hydrogen-rich superconductors for which raw R(T, B_appl) data are available to date.

Phase and data source	Figures	Pressure (GPa)	T_c (K)	ΔT_c (K)	B_c2(0) (T)	ΔB_c2(0) (T)
Unannealed sulfur hydride [Fig. 3(a) in Ref. 1]	2	155	13.9	0.3	6.3	0.4
Annealed H₃S (Fig. 3 in Ref. 31)	S1(a)	155	185	2	98.8	1.2
Annealed H₃S (Figs. S1 and S2 in Ref. 31)	S1(b)	155	196.1	0.6	71.1	1.1
Annealed H₃S (Fig. 3 in Ref. 31)	S1(c)	160	143.9	1.4	59.2	2.3
Annealed CeH₉ [Fig. S7(a) in Ref. 12], cooling	S2(a)	88	38.8	0.4	16.5	1
Annealed CeH₉ [Fig. 1(c) in Ref. 12], warming	S2(b)	139	88.6	0.3	22.2	0.7
Annealed CeH₉ [Fig. 1(d) in Ref. 12], cooling	S2(c)	137	81.9	0.7	18.4	0.7
Annealed CeH₉ [Fig. 1(d) in Ref. 12], warming	S2(d)	137	82.7	0.7	18.7	0.6
Annealed LaH₁₀ [Fig. 3(a) in Ref. 60]	S3(a)	120	174.8	0.8	90	3
Annealed LaH₁₀ [Fig. 3(b) in Ref. 60]	S3(b)	136	206.2	0.8	136	3
Annealed YD₆ [Fig. S13(a) in Ref. 4]	S4(a)	172	157.7	0.2	124.9	2.4
Annealed YH₆ [Fig. S16(c) in Ref. 4]	S4(b)	200	206.2	0.2	97.2	1.4
Annealed (La,Y)H₁₀ [Fig. S27(b) in Ref. 8]	S5(a)	183	203.5	0.2	101.6	1.8
Annealed (La,Y)H₁₀ [Fig. S28(a) in Ref. 8]	S5(b)	182	234	0.1	135.8	1.5
Annealed (La,Y)H₁₀ [Fig. S28(a) in Ref. 8]	S5(c)	186	234.5	0.1	134	1
Annealed SnH₁₂ [Fig. 4(a) in Ref. 11], cooling	S6(a)	190	62.8	0.4	9	0.2
Annealed SnH₁₂ [Fig. 4(a) in Ref. 11], warming	S6(b)	190	64.1	0.5	8.9	0.2
Annealed ThH₉ [Fig. 4(a) in Ref. 16]	S7(a)	170	151.2	1.5	32	0.9
Annealed ThH₁₀ [Fig. 4(a) in Ref. 16]	S7(b)	170	150.6	0.4	43.4	0.6
Th₄H₁₅ (Ref. 74)		Ambient	8.2	0.15	2.75	0.25

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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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Paper Information

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Received: Mar. 15, 2022

Accepted: Jul. 22, 2022

Published Online: Oct. 8, 2022

The Author Email: Talantsev Evgeny F. (evgney.talantsev@imp.uran.ru)

DOI:10.1063/5.0091446

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Table 1. Deduced Bc20 and Tc values for hydrogen-rich superconductors for which raw R(T, Bappl) data are available to date.

Table 1. Deduced Bc20 and Tc values for hydrogen-rich superconductors for which raw R(T, Bappl) data are available to date.

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Table 1. Deduced $B_{c 2} (0)$ and T_c values for hydrogen-rich superconductors for which raw R(T, B_appl) data are available to date.

Table 1. Deduced $B_{c 2} (0)$ and T_c values for hydrogen-rich superconductors for which raw R(T, B_appl) data are available to date.