Effect of the sample geometry on the second magnetization peak in single crystalline BaKBiO thick film
arXiv:cond-mat/9912346 · doi:10.1016/S0038-1098(99)00582-7
Abstract
Magnetization hysteresis loop measurements performed on a single crystalline BaKBiO superconducting thick film reveal pronounced sample geometry dependence of the "second magnetization peak" (SMP), i.e. a maximum in the width of occurring at the field . In particular, it is found that the SMP vanishes decreasing the film dimension. We argue that the observed sample geometry dependence of the SMP cannot be accounted for by models which assume a vortex pinning enhancement as the origin of the SMP. Our results can be understood considering the thermomagnetic instability effect and/or non-uniform current distribution at in large enough samples.
8 pages 3 figures