Equilibrium first-order melting and second-order glass transitions of the vortex matter in Bi2Sr2CaCu2O8 |
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Authors: | Beidenkopf H Avraham N Myasoedov Y Shtrikman H Zeldov E Rosenstein B Brandt E H Tamegai T |
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Institution: | Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel. |
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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. |
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