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Vortex Dynamics and Dissipation in High Temperature Superconductors — from DC to Microwave Frequencies

Published online by Cambridge University Press:  26 February 2011

N.-C. Yeh ,
W. Jiang ,
D. S. Reed ,
U. Kriplani ,
F. Holtzberg ,
A. Gupta  and
A. Kussmaul
N.-C. Yeh
Affiliation:
Department of Physics, California Institute of Technology, Pasadena, CA 91125
W. Jiang
Affiliation:
Department of Physics, California Institute of Technology, Pasadena, CA 91125
D. S. Reed
Affiliation:
Department of Physics, California Institute of Technology, Pasadena, CA 91125
U. Kriplani
Affiliation:
Department of Physics, California Institute of Technology, Pasadena, CA 91125
F. Holtzberg
Affiliation:
IBM, Thomas J. Watson Research Center, Yorktown Heights, NY 10598
A. Gupta
Affiliation:
IBM, Thomas J. Watson Research Center, Yorktown Heights, NY 10598
A. Kussmaul
Affiliation:
Francis Bitter National Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, MA 01239
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Abstract

A second-order vortex-solid melting transition in twinned Y-Ba-Cu-O single crystals is manifested by two independent types of electrical transport measurements: the electric field (E) versus current density (J) isotherms, and the ac resistivity (ρ) vs current frequency (ω) isotherms. Universal static and dynamic exponents (ν ≈ 2/3 and Ζ ≈ 3, respectively) are found for magnetic fields ranging from 1 to 90 kOe, frequencies ranging from 0 to 2 MHz, magnetic directions parallel and perpendicular to the crystal c-axis, as well as samples with and without proton irradiations. At microwave frequencies, we find that the vortex dissipation in Nd-Ce-Cu-O epitaxial films is consistent with the viscous motion of individual vortices, due to the break down of the critical scaling theory in the high frequency limit.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 275: Symposium S – Layered Superconductors: Fabrication, Properties and Applications , 1992 , 169
Copyright
Copyright © Materials Research Society 1992

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References

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