Rini Ganguly - Academia.edu (original) (raw)

Rini Ganguly

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Papers by Rini Ganguly

Research paper thumbnail of Real space imaging of metastable flux line lattices in a weakly pinned NbSe2 single crystal

Using low temperature scanning tunnelling spectroscopy down to 350 mK we study variety of vortex ... more Using low temperature scanning tunnelling spectroscopy down to 350 mK we study variety of vortex lattice states that emerge in a weakly pinned NbSe 2 single crystal. Using small magnetic field pulses, and temperature cycling protocols in magnetic field we access various vortex lattice configurations characterised by different degree of order: Quasi long range ordered states characterised by the absence of topological defects and vortex glass states characterised by the proliferation of dislocations. We explicitly show that the quasi long range ordered state comprises of several metastable states with different "local" configuration of the vortex lattice, consistent with predictions of a Bragg glass. *

Research paper thumbnail of Real space imaging of metastable Bragg glass states in a weakly pinned Type II superconductor

Research paper thumbnail of Direct evidence of two-step disordering of the vortex lattice in a 3 dimensional superconductor, Co0. 0075NbSe2

The vortex lattice in a Type II superconductor provides a rich playground to investigate the orde... more The vortex lattice in a Type II superconductor provides a rich playground to investigate the order-disorder transition in a periodic medium in the presence of random pinning. Here, using scanning tunnelling spectroscopy in a weakly pinned Co0.0075NbSe2 single crystal, we show the existence of a hexatic state between the quasi-long range ordered Bragg glass and the fully disordered vortex glass state. By step by step imaging of the vortex lattice as a function of magnetic field at 350 mK, we show that the equilibrium Bragg glass realised at low magnetic field first transforms into a hexatic glass through the proliferation of dislocations.

Research paper thumbnail of Real space imaging of metastable flux line lattices in a weakly pinned NbSe2 single crystal

Using low temperature scanning tunnelling spectroscopy down to 350 mK we study variety of vortex ... more Using low temperature scanning tunnelling spectroscopy down to 350 mK we study variety of vortex lattice states that emerge in a weakly pinned NbSe 2 single crystal. Using small magnetic field pulses, and temperature cycling protocols in magnetic field we access various vortex lattice configurations characterised by different degree of order: Quasi long range ordered states characterised by the absence of topological defects and vortex glass states characterised by the proliferation of dislocations. We explicitly show that the quasi long range ordered state comprises of several metastable states with different "local" configuration of the vortex lattice, consistent with predictions of a Bragg glass. *

Research paper thumbnail of Real space imaging of metastable Bragg glass states in a weakly pinned Type II superconductor

Research paper thumbnail of Direct evidence of two-step disordering of the vortex lattice in a 3 dimensional superconductor, Co0. 0075NbSe2

The vortex lattice in a Type II superconductor provides a rich playground to investigate the orde... more The vortex lattice in a Type II superconductor provides a rich playground to investigate the order-disorder transition in a periodic medium in the presence of random pinning. Here, using scanning tunnelling spectroscopy in a weakly pinned Co0.0075NbSe2 single crystal, we show the existence of a hexatic state between the quasi-long range ordered Bragg glass and the fully disordered vortex glass state. By step by step imaging of the vortex lattice as a function of magnetic field at 350 mK, we show that the equilibrium Bragg glass realised at low magnetic field first transforms into a hexatic glass through the proliferation of dislocations.

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