Volume 72, Number 3, November 2005
|Page(s)||451 - 457|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||05 October 2005|
Strongly nonlinear magnetization above Tc in
Department of Physics, Princeton University - NJ 08544, USA
2 Department of Physics, Boston College - Chestnut Hill, MA 02467, USA
3 Central Research Institute of Electric Power Industry Komae, Tokyo 201-8511, Japan
Accepted: 12 September 2005
Using high-resolution magnetometry we have investigated in detail the magnetization M above the critical temperature Tc in . In a broad range of temperature T above Tc, we find that is strongly non-linear in the field H. We show that as , the susceptibility diverges to very large values () if measured in weak H. In addition, displays an anomalous non-analytic form in weak fields with a strongly T-dependent exponent . These features strongly support the proposal that, above Tc, the pair condensate survives to support significant London rigidity.
PACS: 74.72.-h – Cuprate superconductors (high-Tc and insulating parent compounds) / 74.25.Ha – Magnetic properties of superconductors / 74.25.Dw – Superconductivity phase diagrams
© EDP Sciences, 2005
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