Abstract
We report measurements of the vortex-transport entropy in the high-temperature superconductor Nd 1.85Ce 0.15CuO 4− σ . 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.
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