Collective flux pinning in hexatic vortex fluid in a-MoGe thin film. (13th November 2019)

• Record Type: Journal Article
• Authors: Dutta, Surajit; Roy, Indranil; Basistha, Somak; Mandal, Soumyajit; Jesudasan, John; Bagwe, Vivas; Raychaudhuri, Pratap
• Is Part Of: Journal of physics. Volume 32:Number 7(2020)
• Publication Date: 2019-11-13
• Subjects: amorphous thin film -- superconductivity -- peak effect -- hexatic vortex fluid -- isotropic vortex liquid -- collective pinning -- thermally activated flux flow; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/ab52b8
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: We investigate the magnetic field variation of the thermally activated flux flow resistivity, ρ TAFF and flux flow critical current density, J c, in a weakly pinned thin film of the amorphous superconductor a -MoGe, where vortices are in a fluid state over a large range of magnetic fields. We show that both quantities can be understood within the framework of collective pinning theory. In particular, our results demonstrate that a 'peak effect' can arise at the order–disorder transition of the vortex lattice even when both the ordered and disordered states are vortex fluids, such as the boundary between a hexatic vortex fluid and an isotropic vortex liquid.