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Possible new vortex matter phases in BSCCO

Dan T. Fuchs, Eli Zeldov, Tsuyoshi Tamegai, Shuuichi Ooi, Michael Rappaport, Hadas Shtrikman

cond-mat.supr-conarXiv:cond-mat/9804205

Abstract

The vortex matter phase diagram of BSCCO crystals is analyzed by investigating vortex penetration through the surface barrier in the presence of a transport current. The strength of the effective surface barrier, its nonlinearity, and asymmetry are used to identify a possible new ordered phase above the first-order transition. This technique also allows sensitive determination of the depinning temperature. The solid phase below the first-order transition is apparently subdivided into two phases by a vertical line extending from the multicritical point.

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