Experimental evidence for a multicritical point in the magnetic phase diagram for the mixed state of clean untwinned YBa2Cu3O7

H. Safar, P. L. Gammel, David A. Huse, D. J. Bishop, W. C. Lee, J. Giapintzakis, D. M. Ginsberg

Research output: Contribution to journalArticle

231 Scopus citations

Abstract

We report on transport measurements in fields up to 16 T in clean, untwinned single crystals of YBa2Cu3O7 which indicate that there is a critical end point for first-order melting in the H-T phase diagram in the mixed state of that system. Our data show that at a well defined value of the magnetic field, the phase boundary sharply changes slope where the first-order melting transition gives way to a second-order vortex-glass transition. These data suggest that the recently observed first-order transition is robust in the presence of a finite amount of disorder and that the vortex-glass transition only occurs for disorder beyond a certain critical amount.

Original languageEnglish (US)
Pages (from-to)3800-3803
Number of pages4
JournalPhysical Review Letters
Volume70
Issue number24
DOIs
StatePublished - Jan 1 1993
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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