Critical currents of the Chevrel phase Pb1-xGdxMo6S8

Zheng, DN; Hampshire, DP

Abstract

A series of Chevrel phase Pb1-xGdxMo6S8 bulk samples have been made using a hot isostatic pressing (HIP) process. Dc magnetic measurements have been carried out on the samples. The critical current density J(c) has been calculated from magnetic hysteresis data using the Bean model. The data show that by increasing the substitution of Gd for Pb J(c) is decreased. In particular, the field sensitivity of J(c) increases markedly as more Gd is added to the samples. However, it was found that although the magnitude of J(c) changes significantly with Gd substitution the pinning force curves for all samples can be described by the Kramer relation F-p = J(c)xB proportional to b(1/2)(1-b)(2) over a wide temperature range. This indicates that J(c) is limited by one dominant flux pinning mechanism in these samples. The irreversibility field B-irr was obtained by extrapolating linearly the Kramer plots (J(c)(1/2)B(1/4) versus B) to J(c)(1/2)B(1/4)=0. The data again show that B-irr decreases dramatically with the addition of Gd.

Citation

Zheng, D., & Hampshire, D. (1995). Critical currents of the Chevrel phase Pb1-xGdxMo6S8.

• Publication Date: 1995
• Volume: 148
• Pages: 255-258
• Series Title: INSTITUTE OF PHYSICS CONFERENCE SERIES
• Series ISSN: 0951-3248