TY - JOUR
T1 - Effects of quantum and thermal fluctuations on collective pinning and critical current density in type-II superconducting bulk materials
AU - Chou, Ming Ju
AU - Horng, Herng Er
PY - 2011/2/10
Y1 - 2011/2/10
N2 - The effects of quantum and thermal fluctuations on collective pinning and critical current density Jc are investigated for bulk type-II superconductors by utilizing quantum statistics. It is shown that for a constant magnetic field, Jc is nearly independent of temperature in the quantum limit; however, in the classical limit, Jc decreases weakly with increasing temperature when T < Tdp (depinning temperature); when Tdp < T < Tf (boundary fluctuation temperature), Jc is power-law-decaying, and when T > T f, Jc decays exponentially. For constant temperature, Jc first decreases, then increases after reaching a maximum, and finally decreases again. These results are in agreement with the experiments.
AB - The effects of quantum and thermal fluctuations on collective pinning and critical current density Jc are investigated for bulk type-II superconductors by utilizing quantum statistics. It is shown that for a constant magnetic field, Jc is nearly independent of temperature in the quantum limit; however, in the classical limit, Jc decreases weakly with increasing temperature when T < Tdp (depinning temperature); when Tdp < T < Tf (boundary fluctuation temperature), Jc is power-law-decaying, and when T > T f, Jc decays exponentially. For constant temperature, Jc first decreases, then increases after reaching a maximum, and finally decreases again. These results are in agreement with the experiments.
KW - Critical current density
KW - collective pinning
KW - vortex dynamics
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U2 - 10.1142/S0217979211058110
DO - 10.1142/S0217979211058110
M3 - Article
AN - SCOPUS:79953865990
SN - 0217-9792
VL - 25
SP - 609
EP - 618
JO - International Journal of Modern Physics B
JF - International Journal of Modern Physics B
IS - 4
ER -