Vortex phase diagram and vortex dynamics at low temperature in a thick a-MgxB1-x film

被引：0
|
作者：
Okuma, S. [1 ]
Kohara, M. [1 ]
机构：
[1] Tokyo Inst Technol, Res Ctr Low Temp Phys, Meguro Ku, Tokyo 152, Japan
来源：
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2007年 / 460卷
关键词：
phase diagram; flux flow; fluctuations; quantum liquid;
D O I：
10.1016/j.physc.2007.03.313
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We report on the equilibrium vortex phase diagram and vortex dynamics at low temperature T in a thick amorphous (a-)MgxB1-x film based on the measurements of the dc resistivity p and time (t)-dependent component of the flux-flow voltage, delta V(t), respectively. Both rho(T) in perpendicular fields and the vortex phase diagram are qualitatively similar to those for the a-MoxSi1-x films, in which evidence for the quantum-vortex-liquid (QVL) phase has been obtained. In either material system we observe anomalous vortex flow with the asymmetric distribution of delta V(t) in the QVL phase, suggesting that the anomalous flow is a universal phenomenon commonly observed for disordered amorphous films, independent of material. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：1276 / 1277
页数：2
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