Harmonic Generation in the Alternating Magnetic Response of High-Temperature Superconductors

1989 ◽  
Vol 169 ◽  
Author(s):  
A. Shaulov ◽  
R. Bhargava ◽  
D. Dorman
Keyword(s):  
High Temperature ◽  
Harmonic Generation ◽  
Flux Pinning ◽  
High Temperature Superconductors ◽  
Magnetic Behavior ◽  
Bias Field ◽  
Magnetic Response ◽  
Flux Penetration ◽  
Field Temperature ◽  
Harmonic Components

AbstractWe report a novel ac technique for characterizing the magnetic behavior of high-temperature superconductors. This technique is based on monitoring the spectrum of the magnetic response of these materials to small sinusoidal fields. A nonlinear magnetic behavior is indicated by the appearance of harmonic components in the spectrum. Measurements of these harmonics as a function of bias field, temperature and frequency provide valuable information about the processes of flux penetration, flux pinning and motion in these materials.

INTRINSIC MAGNETIZATION RELAXATION PROPERTIES OF Y1:2:3

1991 ◽  
Vol 05 (04) ◽  
pp. 277-284 ◽  
Author(s):  
Y.Y. XUE ◽  
Z.J. HUANG ◽  
L. GAO ◽  
P.H. HOR ◽  
R.L. MENG ◽  
...  
Keyword(s):  
High Temperature ◽  
Critical State ◽  
Flux Pinning ◽  
High Temperature Superconductors ◽  
Distribution Model ◽  
Magnetization Relaxation ◽  
Pinning Potential ◽  
Monotonically Increasing Function ◽  
Monotonically Decreasing Function ◽  
Increasing Function

The intrinsic magnetization relaxation rate R(T)≡dM(t, T)/d ln t and the pinning potential U0(T) have been determined for single crystalline and melt-textured YBa2Cu3O7 (Y1:2:3) high temperature superconductors of different sizes in their critical state. In contrast to previous reports, R(T) is a monotonically decreasing function and U0(T), deduced from R(T), a monotonically increasing function of temperature. The unusual temperature dependence of U0 is qualitatively explained in terms of a collective flux pinning. The U0-distribution model previously proposed for HTS’s is not consistent with certain experimental observations.

Local moments, diamagnetism, and time‐dependent magnetic response of high‐temperature superconductors

1988 ◽  
Vol 64 (10) ◽  
pp. 5812-5814 ◽  
Author(s):  
M. Földeáki ◽  
M. E. McHenry ◽  
G. Kalonji ◽  
R. C. O’Handley
Keyword(s):  
High Temperature ◽  
High Temperature Superconductors ◽  
Time Dependent ◽  
Magnetic Response ◽  
Local Moments

Remanent moment of high-temperature superconductors: Implications for flux-pinning and glassy models

1988 ◽  
Vol 38 (10) ◽  
pp. 6490-6499 ◽  
Author(s):  
A. P. Malozemoff ◽  
L. Krusin-Elbaum ◽  
D. C. Cronemeyer ◽  
Y. Yeshurun ◽  
F. Holtzberg
Keyword(s):  
High Temperature ◽  
Flux Pinning ◽  
High Temperature Superconductors

Dynamical Properties of Weakly Coupled Josephson Systems

1990 ◽  
Vol 195 ◽  
Author(s):  
K. H. Lee ◽  
T.-K. Xia ◽  
D. Stroud
Keyword(s):  
High Temperature ◽  
Magnetic Fields ◽  
Harmonic Generation ◽  
Finite Temperature ◽  
Josephson Junctions ◽  
High Temperature Superconductors ◽  
Dynamical Behavior ◽  
Critical Currents ◽  
Weakly Coupled ◽  
Dynamical Properties

ABSTRACTWe review recent work on the dynamical behavior of coupled resistively-shunted Josephson junctions, with emphasis on our own calculations. We present a model which allows for the inclusion of finite temperature, disorder, d.c. and a. c. applied currents, and applied magnetic fields. We discuss applications to (a) calculations of critical currents and IV characteristics; (b) harmonic generation and microwave absorption by finite clusters of Josephson junctions; (c) critical energies for vortex depinning; and (d) quantized voltage plateaus in arrays subjected to combined d.c. and a. c. currents. Possible connections to the behavior of granular high-temperature superconductors are briefly discussed.

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