Unusual Field-Dependence of the Intragrain Superconductive Transition in RuSr2EuCu2O8

Abstract

A narrow intragrain phase-lock transition was observed in RuSr2EuCu2O8 under a magnetic field H up to a few Tesla. The corresponding transition temperature, T2, decreases rapidly (about 100 K/T at low fields) with H indicating that the grains of RuSr2EuCu2O8 behave like a Josephson-junction-array instead of a homogeneous bulk superconductor. Our data suggest that the bulk superconducting transition may occur on a length scale well below the grain size of 2 to 6 micrometer.

References in corpus (1)

• Evidence for Possible Phase-Separations in RuSr2(Gd,Ce)2Cu2O10-delta

Cited by in corpus (10)

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• Pressure Effect on the Superconducting and Magnetic Transitions of the Superconducting Ferromagnet RuSr2GdCu2O8
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• Lower critical field and intragrain critical current density in the ruthenate-cuprate RuSr${}_2$Gd${}_{1.5}$Ce${}_{0.5}$Cu${}_2$O${}_{10}$
• On the dc Magnetization, Spontaneous Vortex State and Specific Heat in the superconducting state of the weakly ferromagnetic superconductor RuSr${}_2$GdCu${}_2$O${}_8$
• The upper critical field in superconducting MgB_2