Evidence from resistivity measurements along the c-axis for a transition within the vortex state for H {parallel} ab in single crystal Y{sub 1}Ba{sub 2}Cu{sub 3}O{sub 7}
- CRTBT, Grenoble (France)
The authors developed a new six-face lithography technique on very small Y-123 single crystals, in order to obtain a current flow parallel to a unique crystallographic direction. Using this technique, they observe that the broadening of the resistive transition along the c-axis of a Y-123 single crystal in the presence of strong magnetic fields (H > H{sub c1}) {parallel} ab disappears below a well defined line in the H-T phase diagram. Above this line, dissipation is ohmic and field dependent. Below this line, a discontinuity appears in the resistivity curves, and the I-V behavior is strongly non linear. The shape of the resistive transition below the T{sub m}(H) line has a universal character, which remains unaffected by changes in the amplitude of the field. This unusual behavior contradicts any collective flux pinning model which predicts a field dependent activation energy and suggests a phase transition related to the depinning line.
- OSTI ID:
- 127797
- Report Number(s):
- CONF-920376-; ISSN 0003-0503; TRN: 96:000277
- Journal Information:
- Bulletin of the American Physical Society, Vol. 37, Issue 9; Conference: Meeting of the American Physical Society, Indianapolis, IN (United States), 16-20 Mar 1992; Other Information: PBD: Dec 1992
- Country of Publication:
- United States
- Language:
- English
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