Volume 60, Number 1, October 2002
|Page(s)||127 - 133|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 September 2002|
Universal upper critical field of unconventional superconductors
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
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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