| Issue |
Europhys. Lett.
Volume 42, Number 1, April 1998
|
|
|---|---|---|
| Page(s) | 79 - 84 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1998-00555-0 | |
| Published online | 01 September 2002 | |
Relaxation and anomalous T- and H-dependence
of the μ coefficient
in 
superconductors
Laboratoire d'Etudes des Propriétés Electroniques des
Solides,
Centre National de la Recherche Scientifique, BP. 166, 38042 Grenoble
Cedex 9, France
Received:
7
August
1997
Accepted:
6
February
1998
Ac shielding and classical dc relaxation experiments have been used to study
the flux creep phenomena in the cubic superconductor (
). The relaxation rate is found to be constant (
) at low
temperature and magnetic field and increases sharply as the vortex-glass
transition line is approached. This behavior can be attributed to an anomalous
decrease of the μ exponent (
) close to 
. In
this regime, the temperature dependence of the
apparent critical current J is then directly related to 
as
![$J(T) = J_0/[kT/U_0\cdot\ln(1/\omega \tau)]^{\mu (T)}$](/articles/epl/abs/1998/07/42114/42114_tex_eq8.png)
. A similar analysis can
be made on the J(B) data recently published by Abulafia et al. (Phys. Rev. Lett.,
77
(1996) 1597) on 
single crystals.
PACS: 74.60.Ge – Flux pinning, flux creep, and flux-line lattice dynamics / 74.25.Ha – Magnetic properties
© EDP Sciences, 1998
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