Experimental evidence for a multicritical point in the magnetic phase diagram for the mixed state of clean untwinned YBa2Cu3O7
- Authors
- SAFAR, H; GAMMEL, PL; HUSE, DA; BISHOP, DJ; LEE, WC; GIAPINTZAKIS, J; GINSBERG, DM
- Issue Date
- Jun-1993
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW LETTERS, v.70, no.24, pp 3800 - 3803
- Pages
- 4
- Journal Title
- PHYSICAL REVIEW LETTERS
- Volume
- 70
- Number
- 24
- Start Page
- 3800
- End Page
- 3803
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/151059
- DOI
- 10.1103/PhysRevLett.70.3800
- ISSN
- 0031-9007
- 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.
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