Evidence for a bulk Meissner state in the ferromagnetic superconductor RuSr2GdCu2O8 from dc magnetization

被引：159

作者：

Bernhard, C

Tallon, JL

Brücher, E

Kremer, RK

机构：

[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

[2] Ind Res Ltd, Lower Hutt, New Zealand

来源：

PHYSICAL REVIEW B | 2000年 / 61卷 / 22期

关键词：

D O I：

10.1103/PhysRevB.61.R14960

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

From magnetization measurements we provide evidence that the ferromagnetic superconductor RuSr2GdCu2O8 with T-c approximate to 45 K and T-M approximate to 135 K; exhibits a sizeable diamagnetic signal at low temperature (T-ms = 30 K) and low magnetic field (H-ext<30 Oe), corresponding to a bulk Meissner phase. We argue that a recent negative report [C. W. Chu et at, cond-mat/9910056 (unpublished)] regarding the Meissner effect in Ru-1212 can be explained by impurity scattering or grain-size effects. At intermediate temperatures, T-ms (c), we observe unique thermal hysteresis effects which are characteristic of a spontaneous vortex phase.

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页码：14960 / 14963

页数：4

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