Melting of the Vortex Lattice through Intermediate Hexatic Fluid in an a-MoGe Thin Film
| Autor: | Roy I., Dutta S., Roy Choudhury A.N., Basistha S., MacCari I., Mandal S., Jesudasan J., Bagwe V., Castellani C., Benfatto L., Raychaudhuri P. |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Physical review letters 122 (2019): 047001-1–047001-6. doi:10.1103/PhysRevLett.122.047001 info:cnr-pdr/source/autori:Roy I.; Dutta S.; Roy Choudhury A.N.; Basistha S.; MacCari I.; Mandal S.; Jesudasan J.; Bagwe V.; Castellani C.; Benfatto L.; Raychaudhuri P./titolo:Melting of the Vortex Lattice through Intermediate Hexatic Fluid in an a-MoGe Thin Film/doi:10.1103%2FPhysRevLett.122.047001/rivista:Physical review letters/anno:2019/pagina_da:047001-1/pagina_a:047001-6/intervallo_pagine:047001-1–047001-6/volume:122 |
| Popis: | The hexatic fluid refers to a phase in between a solid and a liquid that has short-range positional order but quasi-long-range orientational order. In the celebrated theory of Berezinskii, Kosterlitz, and Thouless and subsequently refined by Halperin, Nelson, and Young, it was predicted that a two-dimensional hexagonal solid can melt in two steps: first, through a transformation from a solid to a hexatic fluid, which retains quasi-long-range orientational order; and then from a hexatic fluid to an isotropic liquid. In this Letter, using a combination of real space imaging and transport measurements, we show that the two-dimensional vortex lattice in an a-MoGe thin film follows this sequence of melting as the magnetic field is increased. Identifying the signatures of various transitions on the bulk transport properties of the superconductor, we construct a vortex phase diagram for a two-dimensional superconductor. |
| Databáze: | OpenAIRE |
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