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Surface impedance of HTSC single crystals in the microwave band

M. R. Trunin

Osipyan Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region

Abstract: Currently available data on the real, R_s, and imaginary, X_s, parts of the microwave frequency surface impedance Z_s = R_s + i X_s are presented for the high-quality singlecrystal high-temperature superconductors YBa₂Cu₃O_6.95, Ba_0.6K_0.4BiO₃, Tl₂Ba₂CaCu₂O_8-δ, Tl₂Ba₂CuO_{6 + δ}, and Bi₂Sr₂CaCu₂O₈. A high-precision technique for measuring the temperature dependences R_s(T) and X_s(T) in the range 4.2 ≤ T ≤ 150 K is described. Surface impedance and complex conductivity features common to single-crystal high-temperature superconductors are formulated and the temperature variation of these properties is analyzed. To explain the experimental data, a modified two-fluid model is used, which includes quasi-particle scattering and accounts for the characteristic change in the density of superconducting carriers at low and near-critical temperatures. Prospects for the microscopic theory of the high-frequency response of high-temperature superconductors are discussed.

PACS: 74.20.-z, 74.72.-h, 74.90.+n

Received: August 1, 1998

DOI: 10.3367/UFNr.0168.199809b.0931

 English version: Physics–Uspekhi, 1998, 41:9, 843–863

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