The Role of Thermal Phase Fluctuations in Underdoped YBCO Films

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The effect of thermal phase fluctuations (TPF's) on the ab-plane penetration depth, lambda(T), of thin YBa2Cu3O(7-delta) (YBCO) films is found to be much smaller than expected from the paradigm of cuprates as weakly-coupled 2D superconducting layers. A 2D vortex-pair-unbinding transition is observed, but the effective thickness for fluctuations is the film thickness, not a CuO bilayer thickness. In a strongly underdoped YBCO film, Tc= 34 K, TPF's suppress Tc by only about 3 K. They cannot be a significant factor in the suppression of Tc and emergence of the pseudogap with underdoping.
4 pages, 3 figures, submitted to Phys. Rev. Lett

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Superconductivity

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http://salesiana.dossiersoluciones.com/handle/123456789/24351

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0407113
 http://arxiv.org/abs/cond-mat/0407113

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arXiv