Anti-phase Modulation of Electron- and Hole-like States in Vortex Core of Bi2Sr2CaCu2Ox Probed by Scanning Tunneling Spectroscopy

Мацуба, К.; Yoshizawa, Shunsuke; Mochizuki, Yusuke; Mochiku, Takashi; Hirata, Kazuto; Nishida, N.

doi:10.1143/jpsj.76.063704

Cited by 50 publications

(48 citation statements)

References 18 publications

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“…Additionally, when dFF-DW and s PDW coexist without uniform d-wave superconductivity (Fig. 5, dotted green curves), the small gap we obtain is reminiscent of what is measured directly inside the vortex core, where SC is mostly suppressed in the experiments 15,35,61 .…”

supporting

confidence: 67%

“…The behavior of experimental sub-gap structures with position is very specific 35,61 , for example their characteristic energy does not change much when approaching a vortex core. On the other hand, our calculated sub-gap structures depend strongly on the parameters at play, namely the DW wave vector, the magnitudes ∆, t Q and ∆ Q , and bandstructure.…”

Section: Discussionmentioning

confidence: 97%

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Subgap structures and pseudogap in cuprate superconductors: Role of density waves

et al. 2017

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In scanning tunneling microscopy (STM) conductance curves, the superconducting gap of cuprates is sometimes accompanied by small sub-gap structures at very low energy. This was documented early on near vortex cores and later at zero magnetic field. Using mean-field toy models of coexisting d-wave superconductivity (dSC), d -form factor density wave (dFF-DW), and extended s-wave pair density wave (s PDW), we find agreement with this phenomenon, with s PDW playing a critical role. We explore the high variability of the gap structure with changes in band structure and density wave (DW) wave vector, thus explaining why sub-gap structures may not be a universal feature in cuprates. In the absence of nesting, non-superconducting results never show signs of pseudogap, even for large density waves magnitudes, therefore reinforcing the idea of a distinct origin for the pseudogap, beyond mean-field theory. Therefore, we also briefly consider the effect of DWs on a pre-existing pseudogap.

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supporting

confidence: 67%

Section: Discussionmentioning

confidence: 97%

Subgap structures and pseudogap in cuprate superconductors: Role of density waves

et al. 2017

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“…Nevertheless, thanks to its sub-meV resolution, tunneling is particularly useful for investigating the excitation spectrum of superconductors, whose pairing gap can be small-typically 1 meV for a T c of 7 K. This was beautifully illustrated by Giaever and his demonstration of the superconducting gap, 52 and later by the detailed observation of vortex cores [53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70] and impurity resonances [71][72][73][74][75][76][77][78] by STM. The early theory 79 has lead to the idea that the differential conductance is proportional to an effective DOS carrying information about the superconducting gap function, but no information about the band structure.…”

Section: Discussionmentioning

confidence: 99%

Tunneling conductance and local density of states in tight-binding junctions

Berthod

Giamarchi

2011

Phys. Rev. B

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We study the relationship between the differential conductance and the local density of states in tight-binding tunnel junctions where the junction geometry can be varied between the point-contact and the planar-contact limits. The conductances are found to differ significantly in these two limiting cases. We also examine how the matrix element influences the tunneling characteristics and produces contrast in a simple model of scanning tunneling microscope (STM). Some implications regarding the interpretation of STM spectroscopic data in the cuprates are discussed. The calculations are carried out within the real-space Keldysh formalism.

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“…The close connection between the development of an ordered state and the formation of vortices due to an applied magnetic field has been confirmed by a number of experiments. 19,20 It has recently become clear that the high-T c compounds of BSCCO and YBa 2 Cu 3 O 7−x (YBCO) feature a checkerboard-type charge modulation with wave vectors along the bonds of the CuO lattice. 4,[6][7][8][9][10]21 Further, it is well known that under application of a strong magnetic field exceeding 17 T, a striking reconfiguration of the Fermi surface is observed.…”

Section: Introductionmentioning

confidence: 99%

Vortices and charge order in high-Tcsuperconductors

et al. 2014

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We theoretically investigate the vortex state of the cuprate high-temperature superconductors in the presence of magnetic fields. Assuming the recently derived nonlinear σ-model for fluctuations in the pseudogap phase, we find that the vortex cores consist of two crossed regions of elliptic shape, in which a static charge order emerges. Charge density wave order manifests itself as satellites to the ordinary Bragg peaks directed along the axes of the reciprocal copper lattice. Quadrupole density wave (bond order) satellites, if seen, are predicted to be along the diagonals. The intensity of the satellites should grow linearly with the magnetic field, in agreement with the result of recent experiments.

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Anti-phase Modulation of Electron- and Hole-like States in Vortex Core of Bi₂Sr₂CaCu₂O_x Probed by Scanning Tunneling Spectroscopy

Cited by 50 publications

References 18 publications

Subgap structures and pseudogap in cuprate superconductors: Role of density waves

Subgap structures and pseudogap in cuprate superconductors: Role of density waves

Tunneling conductance and local density of states in tight-binding junctions

Vortices and charge order in high-Tcsuperconductors

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