Strongly nonlinear magnetization above Tc in

Lu Li; Yayu Wang; M. J. Naughton; S. Ono; Yoichi Ando; N. P. Ong

doi:10.1209/epl/i2005-10254-4

All issues

Volume 72 / No 3 (November 2005)

Europhys. Lett., 72 3 (2005) 451-457

Abstract

Issue		Europhys. Lett. Volume 72, Number 3, November 2005


Page(s)		451 - 457
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2005-10254-4
Published online		05 October 2005

Europhys. Lett., 72 (3), pp. 451-457 (2005)

Strongly nonlinear magnetization above T_c in $\chem{Bi_2Sr_2CaCu_2O_{8+\delta}}$

Lu Li¹, Yayu Wang¹, M. J. Naughton², S. Ono³, Yoichi Ando³ and N. P. Ong¹

¹ 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

Received: 26 July 2005
Accepted: 12 September 2005

Abstract

Using high-resolution magnetometry we have investigated in detail the magnetization M above the critical temperature T_c in $\chem{Bi_2Sr_2CaCu_2O_8}$ . In a broad range of temperature T above T_c, we find that $M(T,H)$ is strongly non-linear in the field H. We show that as $T\rightarrow T_c$ , the susceptibility $\chi(T,H)$ diverges to very large values ( $\chi \rightarrow -1$ ) if measured in weak H. In addition, $M(H)$ displays an anomalous non-analytic form $M\sim H^{1/\delta}$ in weak fields with a strongly T-dependent exponent $\delta(T)$ . These features strongly support the proposal that, above T_c, the pair condensate survives to support significant London rigidity.

PACS: 74.72.-h – Cuprate superconductors (high-T_c and insulating parent compounds) / 74.25.Ha – Magnetic properties of superconductors / 74.25.Dw – Superconductivity phase diagrams

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