| Issue |
Europhys. Lett.
Volume 53, Number 5, March 2001
|
|
|---|---|---|
| Page(s) | 632 - 638 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2001-00199-0 | |
| Published online | 01 December 2003 | |
Fluctuation-induced diamagnetism at
high reduced
temperatures in 
superconductors
Laboratorio de Baixas Temperaturas e
Superconductividade
Departamento de Física da Materia Condensada
Universidade de Santiago de Compostela -
Santiago de Compostela E-15706, Spain
Corresponding author: fmvidal@usc.es
Received:
11
July
2000
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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