Evidences for pairing of nearly-free quasiparticles from paraconductivity in layered superconducting cuprates

Details Evidences for pairing of nearly-free quasiparticles from paraconductivity in layered superconducting cuprates Evidences for pairing of nearly-free quasiparticles from paraconductivity in layered superconducting cuprates

2007-05-24

arxiv.org/abs/0705.3520v2

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures, text extended, one fig. removed

Scientific paper

We revisit the Aslamazov-Larkin theory of paraconductivity in two dimensions, to distinguish its universal features from the specific features of nearly-free paired fermions. We show that both the numerical prefactor and the temperature dependence of the experimental paraconductivity in underdoped La_{2-x}Sr_xCuO_4 are only compatible with pairing of nearly-free fermionic quasiparticles. This conclusion is strengthened by the analysis of paraconductivity data in the presence of a finite magnetic field, from which we extract a rather low value of the critical field H_{c2}(T=0).

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