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  • Title: Melting of the Vortex Lattice through Intermediate Hexatic Fluid in an a-MoGe Thin Film.
    Author: Roy I, Dutta S, Roy Choudhury AN, Basistha S, Maccari I, Mandal S, Jesudasan J, Bagwe V, Castellani C, Benfatto L, Raychaudhuri P.
    Journal: Phys Rev Lett; 2019 Feb 01; 122(4):047001. PubMed ID: 30768342.
    Abstract:
    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.
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