PARAMAGNETIC AC SUSCEPTIBILITY AT THE FIRST-ORDER VORTEX-LATTICE PHASE-TRANSITION

Citation
N. Morozov et al., PARAMAGNETIC AC SUSCEPTIBILITY AT THE FIRST-ORDER VORTEX-LATTICE PHASE-TRANSITION, Physical review. B, Condensed matter, 54(6), 1996, pp. 3784-3787
Citations number
50
Categorie Soggetti
Physics, Condensed Matter
ISSN journal
01631829
Volume
54
Issue
6
Year of publication
1996
Pages
3784 - 3787
Database
ISI
SICI code
0163-1829(1996)54:6<3784:PASATF>2.0.ZU;2-9
Abstract
A sharp paramagnetic peak in the local ac susceptibility chi' at the f irst-order vortex-lattice phase transition in Bi2Sr2CaCu2O8 crystals i s found. Observation of this peak establishes the thermodynamic nature of the transition and allows accurate evaluation of the equilibrium m agnetization step height, The associated estimated entropy change Delt a s reaches values in excess of 6k(B) per pancake vortex close to T-c. The local chi '' shows two independent dissipation peaks. The broader one is caused by the onset of irreversible magnetization, whereas the narrow one is due to hysteresis at the phase transition.