Temperature, field and current dependence of the flux creep activation energy in bulk MgB2

被引：12

作者：

Botta, D

Chiodoni, A

Gerbaldo, R

Giunchi, G

Ghigo, G

Gozzelino, L

Laviano, F

Minetti, B

Mezzetti, E

机构：

[1] Politecn Torino, Dept Phys, UdR Torino, INFM,INFN,Sez Torino, I-10129 Turin, Italy

[2] Edison SpA, I-20121 Milan, Italy

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2002年 / 369卷 / 1-4期

关键词：

flux creep activation energy; flux pinning; flux-line lattice dynamics; magnesium diboride;

D O I：

10.1016/S0921-4534(01)01248-5

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

In this paper we investigate the behavior of the flux creep activation energy as a function of T, B and J in the temperature range from 4 K up to T(c). The experimental methodology is mainly based on ac susceptibility measurements at different frequencies and applied field, though some dc measurements are referred to along the discussion. A new analysis method is employed in the framework of the flux creep theory to explore the full range of temperature. It turns out that the key energy scale U(0) (T, B) at any external field exhibits a peak. The main outcome of the study is that the peak values are laying along the de irreversibility line (IL) curve, while the points where U(0) = 0 match the ac IL. Then these two curves divide the phase diagram in three reference regions to be investigated in details. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：232 / 235

页数：4

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