The Nernst effect in high-$T_c$ superconductors

Details The Nernst effect in high-$T_c$ superconductors The Nernst effect in high-$T_c$ superconductors

2005-10-18

arxiv.org/abs/cond-mat/0510470v1

Phys. Rev. B 73, 024510 (2006)

Physics

Condensed Matter

Superconductivity

21 pages, 28 figures

Scientific paper

10.1103/PhysRevB.73.024510

The observation of a large Nernst signal $e_N$ in an extended region above the critical temperature $T_c$ in hole-doped cuprates provides evidence that vortex excitations survive above $T_c$. The results support the scenario that superfluidity vanishes because long-range phase coherence is destroyed by thermally-created vortices (in zero field), and that the pair condensate extends high into the pseudogap state in the underdoped (UD) regime. We present a series of measurements to high fields $H$ which provide strong evidence for this phase-disordering scenario.

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