Flux creep relaxation in single crystal Hg-1201

M. Baenitz, K. Lüders, N. Barišić, Y. Cho, Y. Li, G. Yu, X. Zhao, M. Greven

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Abstract

Magnetization measurements on a single crystal of the high-Tc cuprate HgBa2CuO4 (Hg-1201) are performed for the two field orientations B||c and B||(a,b). Besides zero-field-cooling (zfc) - field-cooling (fc) and magnetization studies, the flux creep relaxation is determined. The zfc curves exhibit pronounced step-like anomalies in the mixed state above the lower critical field Bc1. They are interpreted as those points in the phase diagram where the penetrating flux fronts meet at the center of the sample. In order to obtain more information about the flux pinning mechanism flux creep relaxation experiments are performed at different temperatures in magnetic fields of 0.15 and 2 T. The resulting supercurrent dependence on the mean activation energy is analysed according to the collective pinning theory which predicts U ((j/jc) -1). The μ-values for B||c are 0.5 at higher temperatures and 2 at 5 K, and they vary between 1.1 and 1.5 for B||(a,b). The observed behaviour is quite different from that found for powder samples.

Original languageEnglish (US)
Article number012024
JournalJournal of Physics: Conference Series
Volume234
Issue numberPART 1
DOIs
StatePublished - Jan 1 2010

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