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

A. Forget; D. Colson; F. Rullier-Albenque; H. Alloul; P. Lejay; R. Tourbot

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

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arxiv cond-mat/0507308 v2 pith:FMZ3VYCD submitted 2005-07-13 cond-mat.supr-con cond-mat.str-el

F. Rullier-Albenque , R. Tourbot , H. Alloul , P. Lejay , D. Colson , A. Forget This is my paper

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keywords disordernernstcrystalscuprateseffectfoundinducedphase

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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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