Title: Paraconductivity of underdoped La2-xSrxCuO4 thin-film superconductors using high magnetic fields
Authors: Leridon, B ×
Vanacken, Johan
Wambecq, Tom
Moshchalkov, Victor #
Issue Date: Jul-2007
Publisher: Published by the American Physical Society through the American Institute of Physics
Series Title: Physical Review B, Condensed Matter and Materials Physics vol:76 issue:1 pages:1-4
Conference: date:ESPCI, CNRS, UPR5, F-75231 Paris 05, France; Katholieke Univ Leuven, INPAC, B-3001 Heverlee, Belgium; LNCMP, F-31400 Toulouse, France
Article number: 012503
Abstract: The contribution of superconducting fluctuations to the conductivity, or paraconductivity, is studied in the underdoped regime of La2-xSrxCuO4 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 regime of Gaussian fluctuations close to the critical temperature. At higher temperature, the paraconductivity exhibits a power-law decrease in temperature (as T-alpha), as was previously shown for underdoped YBa2Cu3O7-delta and Bi2Sr2CaCu2O8+delta 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.
ISSN: 1098-0121
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
× corresponding author
# (joint) last author

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