2006/11/02 by B. Leridon, Brigitte Léridon, J. Vanacken +6
Earth and Planetary Sciences · Physics and Astronomy · #FOS: Physical sciences #High-pressure geophysics and materials #Physics of Superconductivity and Magnetism #Superconductivity (cond-mat.supr-con) #Theoretical and Computational Physics #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.cond-mat/0611061
10 pages, 3 figures, 1 bib file
openalex publication_date 2006/11/02 · arxiv created 2007/02/28 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 (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 YBa2Cu3O7-δ and Bi2Sr2CaCu2O8+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 TC in the pseudogap state.