Phase Coherence Effects in the Vortex Transport Entropy

Details Phase Coherence Effects in the Vortex Transport Entropy Phase Coherence Effects in the Vortex Transport Entropy

2008-08-22

arxiv.org/abs/0808.3015v1

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures. Accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.101.117002

Nernst and electrical resistivity measurements in superconducting YBCO and BSCCO with and without columnar defects show a distinctive thermodynamics of the respective liquid vortex matter. At a field dependent high temperature region in the phase diagram the Nernst signal is independent of structural defects in both materials. At lower temperatures, in YBCO, defects contribute only to the vortex mobility and the transport entropy is that of a system of vortex lines. The transition to lower temperatures in BSCCO has a different origin, the maximum in the Nernst signal when decreasing temperature is not associated with transport properties but with the entropy behavior of pancake vortices in the presence of structural defects.

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