Upper Critical Field and its Anisotropy of EuBa2Cu3O7-x and GdBa2Cu3O7-x Studied in Preferentially Oriented Pellets
- 1 December 1987
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 26 (12A) , L2034
- https://doi.org/10.1143/jjap.26.l2034
Abstract
Upper critical field H c2 and its anisotropy are studied in disk samples of EuBa2Cu3O7-x and GdBa2Cu3O7-x . Preferentially oriented samples with c-axis perpendicular to the disk plane show anisotropic behavior of H c2 for midpoints and almost isotropic behavior for the offset field. The critical field slopes (-dH c2/dT) for offset field are 0.9∼1.1 T/K for both Eu-compound and Gd-compound. An analysis based on a model of a quasi-two-dimensional anisotropic superconductor suggests that the anisotropy factor ε is 0.16 for both materials. A degradation of the critical field values was observed in these materials in a shorter period of time after sintering than in the case of Y-, Ho- and Er-compounds.Keywords
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