Anomalous Hc1(T) behavior of single crystalline YBa2Cu3O7-δ

Adrian, H.; Assmus, W.; Höhr, A.; Kowalewski, J.; Spille, H.; Steglich, F.

doi:10.1016/0921-4534(89)91039-3

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Anomalous H_c1(T) behavior of single crystalline YBa₂Cu₃O_7-δ

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Adrian, H., Assmus, W., Höhr, A., Kowalewski, J., Spille, H., & Steglich, F. (1989). Anomalous H_c1(T) behavior of single crystalline YBa₂Cu₃O_7-δ. Physica C, 162, 329-330. doi:10.1016/0921-4534(89)91039-3.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-D4ED-4

Abstract

We report dc-magnetization measurements M(T,H) on a single crystal of YBa2Cu3O7-δ using a SQUID magnetometer. From the M(T,H) data we determined the lower critical field Hc1(T). For both orientations of the field, parallel and perpendicular to the c-axis, we find remarkable anomalous enhancements of H∥c1(T) and H∥c1(T) for T < 40K compared to the behavior expected from the data for T > 40K.