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APS » Journals » Phys. Rev. B » Volume 53 » Issue 17
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Phys. Rev. B 53, 11807–11816 (1996)

Magnetization jumps and irreversibility in Bi2Sr2CaCu2O8

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D. E. Farrell and E. Johnston-Halperin
Department of Physics, Case Western Reserve University, Cleveland, Ohio 44106

L. Klein, P. Fournier, and A. Kapitulnik
Department of Applied Physics, Stanford University, Stanford, California 94305-4090

E. M. Forgan and A. I. M. Rae
School of Physics and Space Research, University of Birmingham, Birmingham, England

T. W. Li
Kamerlingh Onnes Laboratorium, Leiden, University, 2300 RA, Leiden, The Netherlands

M. L. Trawick, R. Sasik, and J. C. Garland
Department of Physics, The Ohio State University, Columbus, Ohio 43210

Received 27 November 1995; published in the issue dated 1 May 1996

Using torque magnetometry, the bulk magnetization of single-crystal Bi2Sr2CaCu2O8 has been investigated for temperatures close to the superconducting transition temperature. The results establish that the irreversibility field coincides with the field at which the vortex solid melts. It is also reported that the magnitude of the magnetization jump that can appear at the melting transformation is strongly correlated with the irreversibility displayed by the vortex solid. The accepted interpretation of the magnetization jumps observed in both local and bulk magnetic experiments on high-Tc superconductors is that they provide evidence for an entropy jump at the melting transformation. The results reported here suggest that the magnetization jumps may have an artifactual origin. © 1996 The American Physical Society.

© 1996 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.53.11807
DOI:
10.1103/PhysRevB.53.11807
PACS:
74.60.Ge
 
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