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Melting of 'porous' vortex matter

S. S. Banerjee·A. Soibel·Y. Myasoedov·M. Rappaport·E. Zeldov·M. Menghini·Y. Fasano·F. de la Cruz·C. J. van der Beek·M. Konczykowski·T. Tamegai
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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 (CDs). In this state ordered vortex crystallites are embedded in the 'pores' of a rigid matrix of vortices pinned on CDs. The crystallites melt through a first-order transition while the matrix remains solid. The melting temperature increases with density of CDs 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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S. S. Banerjee, A. Soibel, Y. Myasoedov, M. Rappaport, E. Zeldov, M. Menghini, Y. Fasano, F. de la Cruz, C. J. van der Beek, M. Konczykowski, T. Tamegai. 2003-01-14. Melting of 'porous' vortex matter. https://doi.org/10.1103/physrevlett.90.087004

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