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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2006, Volume 83, Issue 9, Pages 473–478
(Mi jetpl1300)
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This article is cited in 5 scientific papers (total in 5 papers)
CONDENSED MATTER
Observation of a transition from BCS to HTSC-like superconductivity in Ba1 − xKxBiO3 single crystals
G. E. Tsydynzhapov, A. F. Shevchun, M. R. Trunin, V. N. Zverev, D. V. Shovkun, N. V. Barkovskii, L. A. Klinkova Institute of Solid State Physics, Russian Academy of Sciences
Abstract:
The temperature dependences of the upper critical field B c2(T) and surface impedance Z(T) = R(T) + iX(T) have been measured in Ba1 − x KxBiO3 single crystals with transition temperatures 6 ≤ T c ≤ 32 K (0.6 > x > 0.4). A transition from the BCS to an unusual type of superconductivity has been revealed: B c2(T) curves of the crystals with T c > 20 K have positive curvature (as in some HTSCs), and those of the crystals with T c < 15 K described by the usual Werthamer-Helfand-Hohenberg (WHH) formula. The R(T) and X(T) dependences of the crystals with T c ≈ 32 K and T c ≈ 11 K in the temperature range T ≪ T c are linear (as in HTSCs) and exponential (BCS), respectively. The experimental results are discussed using the extended saddle point model by Abrikosov.
Received: 31.03.2006
Citation:
G. E. Tsydynzhapov, A. F. Shevchun, M. R. Trunin, V. N. Zverev, D. V. Shovkun, N. V. Barkovskii, L. A. Klinkova, “Observation of a transition from BCS to HTSC-like superconductivity in Ba1 − xKxBiO3 single crystals”, Pis'ma v Zh. Èksper. Teoret. Fiz., 83:9 (2006), 473–478; JETP Letters, 83:9 (2006), 405–409
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Abstract page: | 192 | Full-text PDF : | 60 | References: | 49 |
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