Electronic structure of the Abrikosov vortex core in arbitrary magnetic fields

Golubov, A. A.; Hartmann, Uwe

doi:10.1103/physrevlett.72.3602

Cited by 55 publications

(56 citation statements)

References 12 publications

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“…The latter is calculated by summing over relevant neighbors (r i ) using σ 0 (r) = i 1 − tanh((r i − r)/ξ ) (dark dashed line) with ξ = 23 nm. This approximation agrees with microscopic calculations showing that the intervortex density of states for single band superconductors in the dirty limit is practically negligible for fields below about half H c2 [47][48][49]. The magnetic field increase of the intervortex density of states is pronounced, as shown by the blue points in Fig.…”

Section: Resultssupporting

confidence: 78%

Magnetic field dependence of the density of states in the multiband superconductorβ−Bi2Pd

et al. 2015

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We present very low-temperature scanning tunneling microscopy (STM) experiments on single-crystalline samples of the superconductor β-Bi 2 Pd. We find a single superconducting gap from the zero-field tunneling conductance. However, the magnetic field dependence of the intervortex tunneling conductance is higher than the one expected in a single-gap superconductor. Such an increase in the intervortex tunneling conductance has been found in superconductors with multiple superconducting gaps. We also find that the hexagonal vortex lattice is locked to the square atomic lattice as expected in crystalline superconductors with anisotropic Fermi surfaces. Moreover, we compare the upper critical field H c2 (T ) obtained in our sample with previous measurements and find that H c2 (T ) does not increase by reducing the mean free path. We fit H c2 (T ) and show that multiband Fermi surface is needed to explain the observed behavior. We propose that β-Bi 2 Pd is a single-gap multiband superconductor. We anticipate that single-gap superconductivity might often occur in compounds with anisotropic multiband Fermi surfaces.

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Section: Resultssupporting

confidence: 78%

Magnetic field dependence of the density of states in the multiband superconductorβ−Bi2Pd

et al. 2015

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“…70 Measurements of vortex profiles at different magnetic fields support this idea. 71 Nevertheless, it is not straightforward to relate magnetic-field-induced modifications of core size to the superconducting density of states. 31 Our measurements provide a comparison between zero current and an applied current at the same magnetic field.…”

Section: -3mentioning

confidence: 99%

Supercurrent on a vortex core in 2H-NbSe2: Current-driven scanning tunneling spectroscopy measurements

Vieira

Suderow

2013

Phys. Rev. B

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We report current-driven scanning tunneling spectroscopy (CDSTS) measurements at very low temperatures on vortices in 2H-NbSe 2 . We find that a current produces an increase of the density of states at the Fermi level in between vortices and a reduction of the zero-bias peak at the vortex center. This occurs well below the depairing current. We conclude that a supercurrent affects the low-energy part of the superconducting gap structure of 2H-NbSe 2 .

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“…From both definitions of ξ 1 and ξ 2 (i.e., the initial slope of |∆(r)| and the maximum current), we obtain a similar dependence on H. The shrinkage of the core radius was also reported in STM and µSR experiments. 10,7 There, the results of the field dependence were analyzed in the dirty limit theory by the Wigner-Seitz method (i.e., a circular unit cell is used instead of the periodic boundary condition of the vortex lattice). In our study, we obtain the field dependence in the clean limit, where we treat the periodic boundary condition exactly.…”

Section: B Internal Current Distributionmentioning

confidence: 99%

“…Muon spin resonance (µSR) 7,8 and small angle neutron scattering (SANS) investigate the internal field distribution of the vortex structure. Scanning tunneling microscopy (STM) [9][10][11][12] directly observes the LDOS. These data are often analyzed within conventional phenomenological theories such as the Ginzburg-Landau (GL) theory or the London theory.…”

Section: Introductionmentioning

confidence: 99%

Field dependence of the vortex structure ind-wave ands-wave superconductors

1999

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We study the vortex structure and its field dependence within the framework of the quasi-classical Eilenberger theory to find the difference between the d x 2 −y 2 -and s-wave pairings. We clarify the effect of the d x 2 −y 2 -wave nature and the vortex lattice effect on the vortex structure of the pair potential, the internal field and the local density of states. The d x 2 −y 2 -wave pairing introduces a fourfold-symmetric structure around each vortex core. With increasing field, their contribution becomes significant to the whole structure of the vortex lattice state, depending on the vortex lattice's configuration. It is reflected in the form factor of the internal field, which may be detected by small angle neutron scattering, or the resonance line shape of µSR and NMR experiments. We also study the induced s-and dxy-wave components around the vortex in d x 2 −y 2 -wave superconductors.

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Electronic structure of the Abrikosov vortex core in arbitrary magnetic fields

Cited by 55 publications

References 12 publications

Magnetic field dependence of the density of states in the multiband superconductorβ−Bi2Pd

Magnetic field dependence of the density of states in the multiband superconductorβ−Bi2Pd

Supercurrent on a vortex core in 2H-NbSe2: Current-driven scanning tunneling spectroscopy measurements

Field dependence of the vortex structure ind-wave ands-wave superconductors

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