Upper critical field of as-grown MgB2 thin films by molecular beam epitaxy

被引：4

作者：

Harada, Y

Udsuka, M

Takahashi, T

Nakanishi, Y

Yoshizawa, M

机构：

[1] Iwate Univ, Dept Mat Sci & Engn, Iwate Ind Promot Ctr, Morioka, Iwate 0200852, Japan

[2] Iwate Univ, Grad Sch Engn, Morioka, Iwate 0208551, Japan

来源：

PHYSICA B-CONDENSED MATTER | 2005年 / 359卷

关键词：

superconducting thin film; MgB2; MBE; upper critical field;

D O I：

10.1016/j.physb.2005.01.101

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Superconducting thin films of magnesium diboride (MgB2) were prepared on MgO(001) substrate by molecular beam epitaxy in the co-evaporation conditions of low deposition rate and ultra-high vacuum. A superconducting transition with the onset temperature of 31.2 K was confirmed by both transport and magnetization measurements. The upper critical fields are obtained from measurement of the field dependence of the resistivity. It was estimated that the upper critical field at OK was more than 15T. The upper critical field anisotropy ratio, H-C2.ab(0)/H-C2.c(0), was estimated to be 1.78 from the magnetic field-temperature phase diagram for as-grown MgB2 thin films. (c) 2005 Elsevier B.V. All rights reserved.

引用

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页码：466 / 468

页数：3

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