Enhancement of activation energy in nano diamond doped MgB2 superconductor

被引：8

作者：

Ansari, Intikhab A. ^{[1
]}

Shahabuddin, M. ^{[1
,2
]}

Alzayed, Nasser Saleh ^{[1
]}

Vajpayee, Arpita ^{[3
]}

Awana, V. P. S. ^{[3
]}

Kishan, H. ^{[3
]}

机构：

[1] King Saud Univ, Coll Sci, Dept Phys & Astron, Riyadh 11451, Saudi Arabia

[2] Jamia Millia Islamia, Dept Phys, New Delhi 110025, India

[3] Natl Phys Lab, New Delhi 110012, India

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2010年 / 470卷 / 7-8期

关键词：

Magnesium diboride; Flux creep; Current density; Arrhenius law; CRITICAL-CURRENT DENSITY; MAGNETIC-FIELD DEPENDENCE; FLUX-CREEP; CRITICAL CURRENTS; IRREVERSIBILITY; TEMPERATURE; PERFORMANCE; ADDITIVES; MOTION; H-C2;

D O I：

10.1016/j.physc.2010.02.017

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Temperature dependence behavior of resistivity for nano diamond doped MgB2 superconductor was measured in different magnetic field 0T <= H <= 8T. Irreversibility (H-irr) is enhanced by nano diamond doping. We reveal that flux-creep activation energy is a nonlinear function of current density U-0 alpha J(c)(-0.2). In order to determine the activation energy of thermally activated flux flow, Arrhenius law has been taken into account. The magnetic field dependence of flux flow activation energy of nano diamond doped MgB2 superconductors was calculated from the slope of the linear part of the Arrhenius plot and found to be decrease corresponding with applied field. Therefore, the critical current density of this sample will need to be enhanced for practical applications. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：369 / 372

页数：4

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