Microwave surface impedance at 10 GHz and quasiparticle scattering in YBa2Cu3O7 films

F. Gao; J. W. Kruse; C. E. Platt; M. Feng; M. V. Klein

doi:10.1063/1.110527

Microwave surface impedance at 10 GHz and quasiparticle scattering in YBa₂Cu₃O₇ films

F. Gao, J. W. Kruse, C. E. Platt, M. Feng, M. V. Klein

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

The surface impedance of superconducting YBa₂Cu ₃O₇ films as a function of temperature at 10 GHz has been measured in a parallel plate resonator geometry. The penetration depth λ(T), complex microwave conductivity σ(T), and quasiparticle scattering rate 1/τ(T) were also determined. After a rapid fall as T is lowered below T_c, the surface resistance R_s exhibits a linear dependence from 65 K down to 6 K. As T drops below T_c, the real part of the conductivity σ₁ has a rapid rise, which is attributed to the observed dramatic increase in τ. The normal-fluid density shows a linear behavior at low temperatures, which is inconsistent with s-wave BCS superconductivity.

Original language	English (US)
Pages (from-to)	2274-2276
Number of pages	3
Journal	Applied Physics Letters
Volume	63
Issue number	16
DOIs	https://doi.org/10.1063/1.110527
State	Published - 1993

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.110527

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abstract = "The surface impedance of superconducting YBa2Cu 3O7 films as a function of temperature at 10 GHz has been measured in a parallel plate resonator geometry. The penetration depth λ(T), complex microwave conductivity σ(T), and quasiparticle scattering rate 1/τ(T) were also determined. After a rapid fall as T is lowered below Tc, the surface resistance Rs exhibits a linear dependence from 65 K down to 6 K. As T drops below Tc, the real part of the conductivity σ1 has a rapid rise, which is attributed to the observed dramatic increase in τ. The normal-fluid density shows a linear behavior at low temperatures, which is inconsistent with s-wave BCS superconductivity.",

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AU - Klein, M. V.

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