First-order disorder-driven transition and inverse melting of the vortex lattice

Details First-order disorder-driven transition and inverse melting of the vortex lattice First-order disorder-driven transition and inverse melting of the vortex lattice

2002-02-07

arxiv.org/abs/cond-mat/0202107v1

Physics

Condensed Matter

Superconductivity

9 pages, 6 figures, Physica C, in press

Scientific paper

10.1016/S0921-4534(01)01218-7

Vortex matter phase transitions in the high-temperature superconductor Bi2Sr2CaCu2O8 were studied using local magnetization measurements combined with a vortex 'shaking' technique. The measurements revealed thermodynamic evidence of a first-order transition along the second magnetization peak line, at temperatures below the apparent critical point Tcp. We found that the first-order transition line does not terminate at Tcp, but continues down to at least 30 K. This observation suggests that the ordered vortex lattice phase is destroyed through a unified first-order transition that changes its character from thermally induced melting at high temperatures to a disorder-induced transition at low temperatures. At intermediate temperatures the transition line shows an upturn, which implies that the vortex matter displays 'inverse' melting behavior.

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