MEASUREMENTS OF VORTEX-TRANSPORT ENTROPY IN EPITAXIAL ND1.85CE0.15CUO4-DELTA FILMS - EVIDENCE FOR QUASI-PARTICLE BOUND-STATE QUANTIZATION IN THE VORTEX CORE

被引：10

作者：

JIANG, XG ^{[1
]}

JIANG, W ^{[1
]}

MAO, SN ^{[1
]}

GREENE, RL ^{[1
]}

VENKATESAN, T ^{[1
]}

LOBB, CJ ^{[1
]}

机构：

[1] UNIV MARYLAND,CTR SUPERCONDUCT RES,DEPT PHYS,COLLEGE PK,MD 20742

来源：

PHYSICA C | 1995年 / 254卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(95)00531-5

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report measurements of the vortex-transport entropy in the high-temperature superconductor Nd1.85Ce0.15CuO4-delta. The vortex transport entropy, determined from flux-flow Nernst effect and resistivity measurements, is about 100 times smaller than Maki's theoretical prediction. Using a simple microscopic model, we show that the entropy decrease is a result of the large energy level spacing between quasiparticle bound states in the vortex core, providing strong evidence for the discreteness of these states.

引用

页码：175 / 180

页数：6

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