Creep properties of MgB2 bulk near the irreversibility line

被引：8

作者：

Ghigo, G

Botta, D

Chiodoni, A

Gerbaldo, R

Gozzelino, L

Mezzetti, E

Minetti, B

Ceresara, S

Giunchi, G

Ripamonti, G

机构：

[1] Politecn Torino, Ist Nazl Fis Mat, UdR Torino Politecn, I-10129 Turin, Italy

[2] Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy

[3] Politecn Torino, Dipartimento Fis, I-10129 Turin, Italy

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

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2001年 / 14卷 / 09期

关键词：

D O I：

10.1088/0953-2048/14/9/318

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Using susceptometric measurements at different frequencies and fields we investigate the creep properties of MgB2 near the irreversibility line. The data analysis allows to find the dependence of the pinning energy U on field and temperature. Remarkably, it turns out that the dependence on B and T cannot be separated as U(B, T) = U-0(B) f (T). An analysis aimed at understanding the mechanisms underlying this lack of a scaling law is tried. Self-consistent experimental hints prove that different creep mechanisms are active in low-frequency/low-field and high-frequency/high-field regions.

引用

页码：722 / 725

页数：4

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