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

Authors
JIANG XG JIANG W MAO SN GREENE RL VENKATESAN T LOBB CJ
Citation
Xg. Jiang et al., MEASUREMENTS OF VORTEX-TRANSPORT ENTROPY IN EPITAXIAL ND1.85CE0.15CUO4-DELTA FILMS - EVIDENCE FOR QUASI-PARTICLE BOUND-STATE QUANTIZATION IN THE VORTEX CORE, Physica. C, Superconductivity, 254(1-2), 1995, pp. 175-180
Citations number
26
Categorie Soggetti
Physics, Applied
Journal title
Physica. C, Superconductivity → ACNP
ISSN journal
09214534
Volume
254
Issue
1-2
Year of publication
1995
Pages
175 - 180
Database
ISI
SICI code
0921-4534(1995)254:1-2<175:MOVEIE>2.0.ZU;2-V
Abstract
We report measurements of the vortex-transport entropy in the high-tem perature superconductor Nd1.85Ce0.15CuO4-delta. The vortex transport e ntropy, determined from flux-flow Nernst effect and resistivity measur ements, is about 100 times smaller than Maki's theoretical prediction. Using a simple microscopic model, we show that the entropy decrease i s a result of the large energy level spacing between quasiparticle bou nd states in the vortex core, providing strong evidence for the discre teness of these states.