Structural studies of metastable and equilibrium vortex lattice domains in MgB2
نویسندگان
چکیده
منابع مشابه
Persistence of metastable vortex lattice domains in MgB2 in the presence of vortex motion.
Recently, extensive vortex lattice metastability was reported in MgB2 in connection with a second-order rotational phase transition. However, the mechanism responsible for these well-ordered metastable vortex lattice phases is not well understood. Using small-angle neutron scattering, we studied the vortex lattice in MgB2 as it was driven from a metastable to the ground state through a series o...
متن کاملObservation of well-ordered metastable vortex lattice phases in superconducting MgB2 using small-angle neutron scattering.
The vortex lattice (VL) symmetry and orientation in clean type-II superconductors depends sensitively on the host material anisotropy, vortex density and temperature, frequently leading to rich phase diagrams. Typically, a well-ordered VL is taken to imply a ground-state configuration for the vortex-vortex interaction. Using neutron scattering we studied the VL in MgB(2) for a number of field-t...
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We report on experiments investigating the depinning dynamics of a strongly pinned vortex lattice in 2H-NbSe2. We find that the depinning process starts at currents that are well below the critical current of the entire lattice and that it is governed by the formation of contiguous channels of mobile vortices connecting the sample edges. We obtain the formation time of the first channel by moni...
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Given a stable configuration of point vortices for steady two-dimensional inviscid, incompressible fluid flow in a domain D, it is shown that there is another stable configuration of stationary vortices in D with vortices near the original vortices plus additional vortices near any points on the boundary where the speed of the original flow is a nonzero relative minimum.
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In this communication we argue that the Vortex Lattice Melting scenario fails to explain several key experimental results published in the literature. From a careful analysis of these results we conclude that the Flux Line Lattice (FLL) does not melt along a materialand sample-dependent boundary Hj(T ) but the opposite, it de-couples from the superconducting matrix becoming more ordered. When t...
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ژورنال
عنوان ژورنال: New Journal of Physics
سال: 2019
ISSN: 1367-2630
DOI: 10.1088/1367-2630/ab20eb