title: Equilibrium first-order melting and second-order glass transitions of the vortex matter in Bi2Sr2CaCu2O8.
abstract: The thermodynamic phase diagram of Bi2Sr2CaCu2O8 was mapped by measuring local equilibrium magnetization M(H,T) in the presence of vortex shaking. Two equally sharp first-order magnetization steps are revealed in a single temperature sweep, manifesting a liquid-solid-liquid sequence. In addition, a second-order glass transition line is revealed by a sharp break in the equilibrium M(T) slope. The first- and second-order lines intersect at intermediate temperatures, suggesting the existence of four phases: Bragg glass and vortex crystal at low fields, glass and liquid at higher fields.
authors.affiliation: Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel.
authors.forename: H
authors.initials: H
authors.lastname: Beidenkopf
authors.forename: N
authors.initials: N
authors.lastname: Avraham
authors.forename: Y
authors.initials: Y
authors.lastname: Myasoedov
authors.forename: H
authors.initials: H
authors.lastname: Shtrikman
authors.forename: E
authors.initials: E
authors.lastname: Zeldov
authors.forename: B
authors.initials: B
authors.lastname: Rosenstein
authors.forename: E H
authors.initials: EH
authors.lastname: Brandt
authors.forename: T
authors.initials: T
authors.lastname: Tamegai