Density of states in a vortex core and the zero-bias tunneling peak

Shore, Joel D.; Huang, Mingshu; Dorsey, Alan T.; Sethna, James P.

doi:10.1103/physrevlett.62.3089

Cited by 133 publications

(91 citation statements)

References 10 publications

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“…It has been demonstrated that, in cuprate superconductors, the quasi-particle DOS in a vortex core shows a suppression and two low-energy subgap peaks (or kinks) near the Fermi energy 10-14 . These results, distinct from the theoretical predictions for a superconductor with either s-wave [4][5][6][7] or d-wave [15][16][17][18] pairing symmetry, are still not well understood, but suggest that the ground state of the cuprate superconductors may be gapped, manifesting an unconventional feature of the "normal state". Recently, a new family of HTSCs, iron-based superconductors (iron pnictides), was discovered 19 .…”

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confidence: 60%

Observation of ordered vortices with Andreev bound states in Ba0.6K0.4Fe2As2

Shan¹,

Wang²,

Shen³

et al. 2011

Nature Phys

129

108

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For a type-II superconductor, when the applied magnetic field is higher than the lower critical value H c1 , the magnetic flux will penetrate into the superconductor and form quantized vortices, which usually are arranged in an Abrikosov lattice. For the newly discovered iron pnictide superconductors, previous measurements have shown that, in electron-doped BaFe 2 As 2 , the vortices form a highly disordered structure 1-3 . In addition, the density of states (DOS) within the vortex cores 1 do not exhibit the Andreev bound states in conventional superconductors 4 -8 . In this Letter, we report the observation of a triangular vortex lattice and the Andreev bound states in hole-doped BaFe 2 As 2 by using a low temperature scanning tunneling microscope (STM). Detailed study of the vortex cores reveals that the spectrum of the Andreev bound states inside the vortex core exhibits a distinct spatial evolution: at the center of the vortex core, it appears as a single peak at 0.5 mV below the Fermi-energy; away from the core center, it gradually evolves into two sub-peaks and they eventually fade out. The drastic differences between the vortex cores of the electron-doped and hole-doped counterparts are illusive to the pairing mechanism of the iron pnictide superconductors.Magnetic flux quantization is one of the important quantum phenomena in the mixed

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mentioning

confidence: 60%

Observation of ordered vortices with Andreev bound states in Ba0.6K0.4Fe2As2

Shan¹,

Wang²,

Shen³

et al. 2011

Nature Phys

129

108

View full text Add to dashboard Cite

show abstract

“…10 The experimental advances naturally led to intensified theoretical studies of SC vortices. Following initial calculations on sSC vortex cores, 11,12 the focus soon turned to dSC cores, [13][14][15][16] and it was concluded that they are indeed metallic with states very close to the Fermi energy. Therefore, it was a surprise when Renner et al observed that the vortex cores of the high-T c superconductor BSCCO was completely devoid of low-lying electronic excitations.…”

mentioning

confidence: 99%

SO(5) theory of insulating vortex cores in high-Tcmaterials

2000

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We study the fermionic states of the antiferromagnetically ordered vortex cores predicted to exist in the superconducting phase of the newly proposed SO(5) model of strongly correlated electrons. Our model calculation gives a natural explanation of the recent STM measurements on BSCCO, which in surprising contrast to YBCO revealed completely insulating vortex cores.PACS numbers: 74.20. De, 74.25.Ha, The SO(5) model is being developed as a candidate theory for the high-T c superconductors. In the seminal paper by Zhang 1 the emphasis was on the phase diagram and the collective (bosonic) modes of the system. The first experimental support or in some sense the motivation for the model was the explanation of the 41 meV magnetic resonance in the superconducting state of YBCO observed by Mook et al.2 Later the energetics of the normal-superconductivity transition was shown to explain experimental data on the condensation energy.

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“…To find the spectrum for (1), some specific model for ∆(r) can be used. Commonly, ∆(r) is taken in the form (see [12][13][14]):…”

Section: The Hamiltonian Reduction For the Low Lying Bound Statesmentioning

confidence: 99%

Localized states near the Abrikosov vortex core in type-II superconductors within zero-range potential model

Kulinskii¹,

Panchenko²

2015

Nanosist.: fiz. him. mat.

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We propose to treat the lowest bound states near the Abrikosov vortex core in type-II superconductors on the basis of the self-adjoint extension of the Hamiltonian of Aharonov-Bohm type with the localized magnetic flux. It is shown that the Hamiltonian for the excitations near the vortex core can be treated in terms of the generalized zero-range potential method when the magnetic field penetration depth δ is much greater than the coherence length ξ i.e. in the limit κ = δ/ξ ≫ 1. In addition, it is shown that in this limit it is the singular behavior of d∆/dr| r=0 and not the details of the order parameter ∆(r) profile that is important. In support of the proposed model, we reproduce the spectrum of the Caroli-de Gennes-Matricon states and provide direct comparison with the numerical calculations of Hayashi, N. et al. [Phys. Rev. Lett. 80, p. 2921]. In contrast to the empirical formula for the energy of the ground state in Hayashi, N. we use no fitting parameter. The parameters for the boundary conditions are determined in a self-consistent manner with Caroli-de Gennes-Matricon formula.

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Density of states in a vortex core and the zero-bias tunneling peak

Cited by 133 publications

References 10 publications

Observation of ordered vortices with Andreev bound states in Ba0.6K0.4Fe2As2

Observation of ordered vortices with Andreev bound states in Ba0.6K0.4Fe2As2

SO(5) theory of insulating vortex cores in high-Tcmaterials

Localized states near the Abrikosov vortex core in type-II superconductors within zero-range potential model

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