Nernst effect and disorder in the normal state of high-T_{c} cuprates

Details Nernst effect and disorder in the normal state of high-T_{c} cuprates Nernst effect and disorder in the normal state of high-T_{c} cuprates

2005-07-13

arxiv.org/abs/cond-mat/0507308v2

Physics

Condensed Matter

Superconductivity

revised version. to be published in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.96.067002

We have studied the influence of disorder induced by electron irradiation on the Nernst effect in optimally and underdoped YBa2Cu3O(7-d) single crystals. The fluctuation regime above T_{c} expands significantly with disorder, indicating that the T_{c} decrease is partly due to the induced loss of phase coherence. In pure crystals the temperature extension of the Nernst signal is found to be narrow whatever the hole doping, contrary to data reported in the low-T_{c} cuprates families. Our results show that the presence of "intrinsic" disorder can explain the enhanced range of Nernst signal found in the pseudogap phase of the latter compounds.

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