Enhancement of Jc by Hf-doping in the superconductor MgB2: A hyperfine interaction study

被引：3

作者：

Talapatra, A. ^{[1
]}

Das, S. K. ^{[1
]}

Bandyopadhyay, S. K. ^{[1
]}

Barat, P. ^{[1
]}

Sen, Pintu ^{[1
]}

Rawat, R. ^{[2
]}

Banerjee, A. ^{[2
]}

Butz, T. ^{[3
]}

机构：

[1] Bhabha Atom Res Ctr, Ctr Variable Energy Cyclotron, Kolkata 700064, W Bengal, India

[2] UGC DAE Consortium Sci Res, Indore 452017, Madhya Pradesh, India

[3] Univ Leipzig, Fak Phys & Geowissensch, Inst Expt Phys 2, D-04103 Leipzig, Germany

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2009年 / 70卷 / 3-4期

关键词：

Superconductors; X-ray diffraction; Superconductivity; FIELD; TI;

D O I：

10.1016/j.jpcs.2008.12.014

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Measurements of the critical current density (J(c)) by magnetisation and the upper critical field (H-c2) by magnetoresistance have been performed for hafnium-doped MgB2. There has been a remarkable enhancement of J(c) as compared to that by ion irradiation without any appreciable decrease in T-c which is beneficial from the point of view of applications. The irreversibility line extracted from J(c) shows an upward shift. In addition, there has been an increase in the upper critical field which indicates that Hf partially substitutes for Mg. Hyperfine interaction parameters obtained from time differential perturbed angular correlation (TDPAC) measurements revealed the formation of HfB and HfB2 phases along with the substitution of HE A possible explanation is given for the role of these species in the enhancement of J(c) in MgB2 superconductor. (C) 2009 Published by Elsevier Ltd.

引用

页码：527 / 532

页数：6

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