Strongly nonlinear magnetization above $T_c$ in $\rm Bi_2Sr_2CaCu_2O_{8+δ}$

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

doi:10.1209/epl/i2005-10254-4

paper

Strongly nonlinear magnetization above $T_{c}$ in $B i_{2} S r_{2} CaC u_{2} O_{8 + δ}$

arXiv:cond-mat/0507617 · doi:10.1209/epl/i2005-10254-4

Abstract

Using high-resolution magnetometry we have investigated in detail the magnetization $M$ above the critical temperature $T_{c}$ in $B i_{2} S r_{2} CaC u_{2} O_{8 + δ}$ . 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 $T \to T_{c}$ , the susceptibility $χ (T, H)$ diverges to very large values ( $χ \to$ -1) if measured in weak $H$ . In addition, $M (H)$ displays an anomalous non-analytic form $M \sim H^{1/ δ}$ in weak fields with a strongly $T$ -dependent exponent $δ (T)$ . These features strongly support the proposal that, above $T_{c}$ , the pair condensate survives to support significant London rigidity.

5 pages, 5 figures

References in corpus (1)

Staggered flux vortices and the superconducting transition in the layered cuprates

Strongly nonlinear magnetization above Tc​ in Bi2​Sr2​CaCu2​O8+δ​

Abstract

References in corpus (1)

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Strongly nonlinear magnetization above $T_{c}$ in $B i_{2} S r_{2} CaC u_{2} O_{8 + δ}$