Superconductivity in the Bi-Sr-Ca(Y,Gd)-Cu-O system: DC magnetic susceptibility and microwave absorption investigations

Sampathkumaran, E. V. ; Sastry, M. D. ; Kadam, R. M. (1989) Superconductivity in the Bi-Sr-Ca(Y,Gd)-Cu-O system: DC magnetic susceptibility and microwave absorption investigations Physica C: Superconductivity, 159 (3). pp. 267-272. ISSN 0921-4534

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/092145...

Related URL: http://dx.doi.org/10.1016/0921-4534(89)90378-X

Abstract

Microwave absorption and DC magnetic susceptibility measurements are carried out on Bi2Sr2Ca2−xRexCu2Oy (RE=Y, Gd; x=0, 0.25 and 0.5). These studies clearly establish the correlation between conventional DC magnetic susceptibility and changes in microwave reflectivity/absorption as the sample is cooled through the superconducting transition temperature (Tc). The results indicate that Tc, as determined by both the methods, initially increases with x, though for higher concentrations of x, superconductivity is suppressed. The Curie-Weiss temperature is found to increase with increasing concentration of Gd. No evidence for the local moment of Cu2+ is found in the EPR measurements. The EPR of Gd3+ is observable below 30 K for x=0.5 with a possible evidence for crystal-field interaction. Absence of Gd3+ EPR signal at higher temperatures, and also for x=0.25, might imply extra pathways for spin-lattice relaxation.

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