Volume 53, Number 5, March 2001
|Page(s)||632 - 638|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 December 2003|
Fluctuation-induced diamagnetism at high reduced temperatures in superconductors
Laboratorio de Baixas Temperaturas e
Departamento de Física da Materia Condensada
Universidade de Santiago de Compostela -
Santiago de Compostela E-15706, Spain
Corresponding author: email@example.com
Accepted: 15 December 2000
By using two randomly oriented polycrystalline YBa2Cu3O samples with masses as big as and , but almost optimally doped ( and ) and with excellent stoichiometric homogeneity, the in-plane fluctuation-induced diamagnetism was determined, for the first time in any superconductor, well inside the so-called short wavelength regime in the zero-magnetic-field limit, which corresponds to reduced temperatures, , above typically . It is then shown that these measurements may be explained in terms of the Schmidt limit of the Gaussian-Ginzburg-Landau approach for bilayered superconductors by introducing a total-energy cut-off in the fluctuation spectrum.
PACS: 74.40.+k – Fluctuations (noise, chaos, nonequilibrium superconductivity, localization. etc.) / 74.72.Bk – Y-based compounds / 74.20.De – Phenomenological theories (two-fluid, Ginzburg-Landau, etc.)
© EDP Sciences, 2001
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