Analysis of the paraconductivity in underdoped $La_{2-x}Sr_xCuO_4$ thin films using high magnetic fields

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dc.creatorLeridon, B.
dc.creatorVanacken, J.
dc.creatorWambecq, T.
dc.creatorMoshchalkov, V. V.
dc.date2006-11-02
dc.date2007-02-28
dc.date.accessioned2026-07-07T07:48:59Z
dc.date.available2026-07-07T07:48:59Z
dc.descriptionThe contribution of superconducting fluctuations to the conductivity, or paraconductivity is studied in the underdoped regime of $La_{2-x}Sr_xCuO_4$ cuprates. A perpendicular magnetic field up to 50 T is applied to suppress the superconductivity and obtain the normal state resistivity which is then used to calculate the paraconductivity. Surprisingly enough, it is consistent with a two-dimensional Aslamazov-Larkin (AL) regime of Gaussian fluctuations close to the critical temperature. At higher temperature, the paraconductivity shows a power-law decrease in temperature (as $T^{-α}$) as was previously shown for underdoped $YBa_2Cu_3O_{7-δ}$ and $Bi_2Sr_2CaCu_2O_{8+δ}$ samples. Our observations are not consistent with the existence of Kosterlitz-Thouless fluctuations. This tends to indicate that the superconducting pair amplitude is not already defined above $T_C$ in the pseudogap state.
dc.description10 pages, 3 figures, 1 bib file
dc.identifierhttps://arxiv.org/abs/cond-mat/0611061
dc.identifierhttp://arxiv.org/abs/cond-mat/0611061
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/124695
dc.subjectSuperconductivity
dc.titleAnalysis of the paraconductivity in underdoped $La_{2-x}Sr_xCuO_4$ thin films using high magnetic fields
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