| Issue |
Europhys. Lett.
Volume 60, Number 1, October 2002
|
|
|---|---|---|
| Page(s) | 127 - 133 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2002-00329-2 | |
| Published online | 01 September 2002 | |
Universal upper critical field of unconventional superconductors
1
Department of Physics, Loughborough University -
Loughborough LE11 3TU, UK
2
Kapitza Institute for Physical Problems - 2 Kosygina
Str., 117334 Moscow, Russia
3
Josef Stefan Institute - 1001 Ljubljana, Slovenia
Received:
27
March
2002
Accepted:
8
July
2002
The resistive upper critical field, 
of cuprates,
superconducting spin-ladders, and organic (TMTSF)2X systems is
shown to follow a universal nonlinear dependence 
in a wide range near 
, while
its low-temperature behaviour depends on the chemical formula and
sample quality. is ascribed to the Bose-Einstein
condensation field of preformed pairs. The universality
originates from the scaling arguments. Exceeding the Pauli
paramagnetic limit is explained. Controversy in the determination
of from the kinetic and thermodynamic measurements
is resolved in the framework of the charged Bose-gas model with
impurity scattering.
PACS: 74.20.-z – Theories and models of superconducting state / 74.72.-h – High- compounds / 74.70.Kn – Organic superconductors
© EDP Sciences, 2002
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