Browsing by Author "Avraham, N"

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Equilibrium first-order melting and second-order glass transitions of the vortex matter in Bi2Sr2CaCu2O8
(2005-12-16)
Beidenkopf, H
;
Avraham, N
;
Myasoedov, Y
;
Shtrikman, H
;
Zeldov, E
The thermodynamic H-T 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.