Field dependence of the vortex core size in a multi-band superconductor

Abstract

The magnetic field dependence of the vortex core size in the multi-band superconductor NbSe2 has been determined from muon spin rotation measurements. The spatially extended nature of the quasiparticle core states associated with the smaller gap leads to a rapid field-induced shrinkage of the core size at low fields, while the more tightly bound nature of the states associated with the larger gap leads to a field-independent core size for fields greater than 4 kOe. A simple model is proposed for the density of delocalized core states that establishes a direct relationship between the field-induced reduction of the vortex core size and the corresponding enhancement of the electronic thermal conductivity. We show that this model accurately describes both NbSe2 and the single-band superconductor V3Si.

4 pages, 4 figures. Version accepted for publication in Physical Review Letters

References in corpus (25)

• Vortices with fractional flux in two-gap superconductors and in extended Faddeev model
• Vortex Imaging in the pi-Band of Magnesium Diboride
• Direct evidence for two-band superconductivity in MgB_2 single crystals from directional point-contact spectroscopy in magnetic fields
• Heat Conduction in the Vortex State of NbSe_2: Evidence for Multi-Band Superconductivity
• Ginzburg-Landau theory of vortices in a multi-gap superconductor
• Specific heat of single crystal MgB_2: a two-band superconductor with two different anisotropies
• Thermal conductivity of single crystalline MgB_2
• Order parameter of MgB_2: a fully gapped superconductor
• Definitive experimental evidence for two-band superconductivity in MgB2
• Field Dependence of Electronic Specific Heat in Two-Band Superconductors
• STM study of multiband superconductivity in NbSe2 using a superconducting tip
• Absolute values of the London penetration depth in YBa2Cu3O6+y measured by zero field ESR spectroscopy on Gd doped single crystals
• Muon-Spin Rotation Measurements of the Magnetic Field Dependence of the Vortex-Core Radius and Magnetic Penetration Depth in NbSe2
• Muon-spin-relaxation study of the magnetic penetration depth in MgB2
• Penetration Depth Measurements in MgB_2: Evidence for Unconventional Superconductivity
• Investigations of the Core Structure of Magnetic Vortices in Type-II Superconductors by muSR
• Effect of two gaps on the flux lattice internal field distribution: evidence of two length scales from muSR in Mg1-xAlxB2
• Shrinking Magnetic Vortices in V3Si Due to Delocalized Quasiparticle Core States: Confirmation of the Microscopic Theory for Interacting Vortices
• Electronic state around vortex in a two-band superconductor
• Field-induced quasiparticle excitations in novel type II superconductors
• Quasiparticle Excitations outside the Vortex Cores in MgB${}_2$ Probed by Muon Spin Rotation
• The effect of magnetic field on the two superconducting gaps in MgB2
• Anisotropy and internal field distribution of MgB2 in the mixed state at low temperatures
• Electronic Thermal Conductivity of Multi-Gap Superconductors with Application to MgB_2
• Specific heat and thermal conductivity in the vortex state of the two-gap superconductor MgB_2

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• Giant Vortices Below the Surface of NbSe${}_2$ Detected Using Low Energy $\beta$-NMR
• Magnetism and Disorder Effects on muSR Measurements of the Magnetic Penetration Depth in Iron-Based Superconductors
• Planar graphene-NbSe${}_2$ Josephson junctions in a parallel magnetic field
• Penetration depth, multiband superconductivity, and absence of muon-induced perturbation in superconducting PrOs${}_4$Sb${}_{12}$
• Anisotropy of the coherence length from critical currents in the stoichiometric superconductor LiFeAs
• Role of CuO chains in vortex core structure in YBa2Cu3O{7-delta}
• Supercurrent on a vortex core in 2H-NbSe${}_2$: current driven scanning tunneling spectroscopy
• On the interpretation of muon-spin-rotation experiments in the mixed state of type-II superconductors
• Muon spin rotation measurements of the vortex state in vanadium: A comparative analysis using iterative and analytical solutions of the Ginzburg-Landau equations
• Vortex spectroscopy in the vortex glass: A real-space numerical approach
• Glassy Dynamics in a heavy ion irradiated NbSe2 crystal
• Lateral imaging of the superconducting vortex lattice using Doppler-modulated scanning tunneling microscopy
• Effect of Delocalized Vortex Core States on the Specific Heat of Nb
• Two-Gap Time Reversal Symmetry Breaking Superconductivity in Non-Centrosymmetric LaNiC2
• Surface structure and multigap superconductivity of V3Si (111) revealed by scanning tunneling microscopy
• Microscopic properties of vortex state in YB6 probed by muon spin rotation
• Probing Vortex Dynamics in 2D Superconductors with Scanning Quantum Microscope
• Abrikosov flux-lines in two-band superconductors with mixed dimensionality
• Two characteristic contributions to the superconducting state of 2$H$-NbSe${}_2$
• Quasiclassical theory of vortex states in locally non-centrosymmetric superconductors: application to CeRh${}_2$As${}_2$
• Torque Theory of Anisotropic Superconductors with No Phenomenological Parameter in determining Vortex Core Size