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• W1972282699 abstract "We present measurements of the vortex-state surface impedance, Z_s = R_s + i X_s, of a high quality, ortho-II-ordered single crystal of the cuprate high temperature superconductor YBa2Cu3O6.52 (T_c = 59K). Measurements have been made at four microwave frequencies (omega/2pi = 2.64, 4.51, 9.12 and 13.97 GHz), for magnetic fields ranging from 0 to 7 T. From these data we obtain the field, frequency and temperature dependence of the vortex viscosity, pinning constant, depinning frequency and flux-flow resistivity. The vortex viscosity, eta(omega,T), has a surprisingly strong frequency dependence and bears a striking resemblance to the zero-field quasiparticle conductivity, sigma_qp(omega,T), suggesting that the dominant dissipative mechanism for the flux lines is induced electric fields coupling to bulk, long-lived d-wave quasiparticles outside the vortex cores. This is in sharp contrast to the conventional Bardeen-Stephen picture, in which dissipation takes place inside quasi-normal vortex cores. The strong frequency dependence of the vortex viscosity in the microwave range requires us to treat it as a complex response function, with an imaginary part that is predicted to contribute to the apparent pinning force on the vortices. Measurements of the frequency dependence of the pinning force confirm that this term is present, and in a form consistent with the requirements of causality. At low temperatures the flux-flow resistivity, rho_ff propto 1/eta, has the form rho_ff(T) = rho_0 + rho_1 ln(1/T), reminiscent of the DC resistivity of cuprates in the pseudogap regime." @default.
• W1972282699 created "2016-06-24" @default.
• W1972282699 creator A5002236713 @default.
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• W1972282699 creator A5082380156 @default.
• W1972282699 creator A5087044455 @default.
• W1972282699 creator A5089899809 @default.
• W1972282699 date "2013-05-28" @default.
• W1972282699 modified "2023-09-25" @default.
• W1972282699 title "Microwave spectroscopy of vortex dynamics in ortho-II YBa<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>Cu<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>O<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mrow><mml:mn>6.52</mml:mn></mml:mrow></mml:msub></mml:math>" @default.
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