Conductivity of underdoped YBa2Cu3O7-d : evidence for incoherent pair correlations in the pseudogap regime

B. Leridon; A. Defossez; J. Dumont; J. Lesueur; J. P. Contour

doi:10.1103/PhysRevLett.87.197007

Conductivity of underdoped YBa2Cu3O7-d : evidence for incoherent pair correlations in the pseudogap regime

Superconductivity 2009-11-07 v1 Strongly Correlated Electrons

Authors: B. Leridon , A. Defossez , J. Dumont , J. Lesueur , J. P. Contour

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Abstract

Conductivity due to superconducting fluctuations studied in optimally doped YBa2Cu3O7-d films displays a stronger decay law in temperature than explainable by theory. A formula is proposed, which fits the data very well with two superconductive parameters, Tc and the coherence length ksi_c0, and an energy scale Delta*. This is also valid in underdoped materials and enables to describe the conductivity up to 300 K with a single-particle excitations channel in parallel with a channel whose contribution is controlled by ksi_c0, Tc and Delta*. This allows to address the nature of the pseudogap in favour of incoherent pairing.

Keywords

conductivity underdoped YBCO superconducting fluctuations pseudogap incoherent pairing

Cite

@article{arxiv.cond-mat/0101094,
  title  = {Conductivity of underdoped YBa2Cu3O7-d : evidence for incoherent pair correlations in the pseudogap regime},
  author = {B. Leridon and A. Defossez and J. Dumont and J. Lesueur and J. P. Contour},
  journal= {arXiv preprint arXiv:cond-mat/0101094},
  year   = {2009}
}

Comments

14 pages, 4 figures, 1 table

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