Lu Li et al 2005 Europhys. Lett. 72 451 doi:10.1209/epl/i2005-10254-4
Lu Li1, Yayu Wang1, M. J. Naughton2, S. Ono3, Yoichi Ando3 and N. P. Ong1
Show affiliationsUsing high-resolution magnetometry we have investigated in detail the magnetization M above the critical temperature Tc in Bi2Sr2CaCu2O8. In a broad range of temperature T above Tc, we find that M(T,H) is strongly non-linear in the field H. We show that as T → Tc, the susceptibility χ(T,H) diverges to very large values (χ → − 1) if measured in weak H. In addition, M(H) displays an anomalous non-analytic form M ~ H1/δ in weak fields with a strongly T-dependent exponent δ(T). These features strongly support the proposal that, above Tc, the pair condensate survives to support significant London rigidity.
74.72.-h Cuprate superconductors (high-Tc and insulating parent compounds)
Issue 3 (November 2005)
Received 26 July 2005, accepted for publication 12 September 2005
Published 5 October 2005
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