Melting of "porous" vortex matter |
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Authors: | Banerjee S S Soibel A Myasoedov Y Rappaport M Zeldov E Menghini M Fasano Y de la Cruz F van der Beek C J Konczykowski M Tamegai T |
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Institution: | Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel. |
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Abstract: | Bitter decoration and magneto-optical studies reveal that in heavy-ion irradiated superconductors, a "porous" vortex matter is formed when vortices outnumber columnar defects. In this state ordered vortex crystallites are embedded in the "pores" of a rigid matrix of vortices pinned on columnar defects. The crystallites melt through a first-order transition while the matrix remains solid. The melting temperature increases with density of columnar defects and eventually turns into a continuous transition. At high temperatures a sharp kink in the melting line is found, signaling an abrupt change from crystallite melting to melting of the rigid matrix. |
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