Mixed-state magnetoresistance of c-axis-oriented MgB2 thin films

被引：7

作者：

Kim, HJ ^{[1
]}

Kang, WN

Kim, HJ ^{[1
]}

Choi, EM

Kim, KHP

Lee, HS

Lee, SI

Mun, MO

机构：

[1] Pohang Univ Sci & Technol, Natl Creat Res Initiat Ctr Superconduct, Pohang 790784, Kyungbuk, South Korea

[2] Pohang Univ Sci & Technol, Dept Phys, Pohang 790784, Kyungbuk, South Korea

[3] Pukyong Natl Univ, Dept Phys, Pusan 608737, South Korea

[4] Yonsei Univ, Inst Phys & Appl Phys, Seoul 120749, South Korea

[5] Yonsei Univ, Dept Phys, Seoul 120749, South Korea

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2003年 / 391卷 / 02期

关键词：

MgB2 thin film; mixed-state magnetoresistance; vortex glass; thermally activated flux-flow;

D O I：

10.1016/S0921-4534(03)01201-2

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We investigated the mixed-state magneto resistance of high quality c-axis-oriented MgB2 thin films while varying the magnetic field and the current density. The temperature dependence of the magneto resistance was well described by a vortex-glass theory for the low dissipative part of the resistivity and by a thermal fluctuation theory near the transition temperature. Interestingly, the observed thermally activated flux-flow region was very narrow or did not exist whereas, compared to conventional superconductors, the vortex-liquid phase was relatively broad in the H-T phase diagram. From the Werthamer-Helfand-Hohenberg theory, we obtained H-e2(0) = 25.4 T, which was consistent with the value measured using a direct method. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：119 / 124

页数：6

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