History effect in inhomogeneous superconductors

Details History effect in inhomogeneous superconductors History effect in inhomogeneous superconductors

2002-09-04

arxiv.org/abs/cond-mat/0209080v1

Physics

Condensed Matter

Superconductivity

To appear in Phys Rev B, October 1 Issue

Scientific paper

10.1103/PhysRevB.66.144510

A model was proposed to account for a new kind of history effect in the transport measurement of a sample with inhomogeneous flux pinning coupled with flux creep. The inhomogeneity of flux pinning was described in terms of alternating weak pinning (lower jc) and strong pinning region (higher jc). The flux creep was characterized by logarithmic barrier. Based on this model, we numerically observed the same clockwise V-I loops as reported in references. Moreover, we predicted behaviors of the V-I loop at different sweeping rates of applied current dI/dt or magnetic fields Ba, etc. Electric transport measurement was performed in Ag-sheathed Bi2-xPbxSr2Ca2Cu3Oy tapes immersed in liquid nitrogen with and without magnetic fields. V-I loop at certain dI/dt and Ba was observed. It is found that the area of the loop is more sensitive to dI/dt than to Ba, which is in agreement well with our numerical results.

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