Superconductivity in amorphous Re Zr (x≈6) thin films

Dutta, Surajit; Bagwe, Vivas; Chaurasiya, Gorakhnath; Thamizhavel, A.; Bapat, Rudheer; Raychaudhuri, Pratap; Bose, Sangita

doi:10.1016/j.jallcom.2021.160258

Cited by 5 publications

(1 citation statement)

References 51 publications

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“…Our sample under investigation is a 20 nm thick a-ReZr thin film grown on oxidised silicon substrate with Tc ~ 5.7 K. a-ReZr is a conventional extreme Type II superconductor 32 with coherence length, ~5.9…”

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confidence: 99%

Inverse melting and re-entrant transformations of the vortex lattice in amorphous Re6Zr thin film

Raychaudhuri,

Duhan,

Sengupta

et al. 2024

Preprint

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Melting of a solid is one of the most ubiquitous phenomena observed in nature. Most solids, when heated, melt from a crystalline state to an isotropic liquid at a characteristic temperature. There are however situations where increase in temperature can induce a transition to a more ordered state1. Broadly termed as “inverse melting”, experimental realisations of such situations are rare2,3,4. Here, we report such a phenomenon in the 2-dimensional vortex liquid that forms in a moderately pinned amorphous Re6Zr (a-ReZr) thin film, from direct imaging of the vortex lattice using a scanning tunnelling microscope. At low temperature and magnetic fields, we find that the vortices form a “pinned liquid”, that is characterised by a low mobility of the vortices and vortex density that is spatially inhomogeneous. As the temperature or magnetic field is increased the vortices become more ordered, eventually forming a nearly perfectly ordered vortex lattice. Above this temperature/magnetic field, the ordered vortex lattice melts again into a vortex liquid. This re-entrant transformation from a liquid to solid-like state and then back to a liquid also leaves distinct signature in the magnetotransport properties of the superconductor.

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confidence: 99%