Abstract
Low-magnetic-field scanning tunneling spectroscopy of individual Abrikosov vortices in heavily overdoped Bi2Sr2CaCu2O8+δ unveils a clear d-wave electronic structure of the vortex core, with a zero-bias conductance peak at the vortex center that splits with increasing distance from the core. We show that previously reported unconventional electronic structures, including the low-energy checkerboard charge order in the vortex halo and the absence of a zero-bias conductance peak at the vortex center, are direct consequences of short intervortex distance and consequent vortex-vortex interactions prevailing in earlier experiments.Received 16 February 2021Revised 29 April 2021Accepted 17 June 2021DOI:https://doi.org/10.1103/PhysRevX.11.031040Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasLocal density of statesVortices in superconductorsd-wavePhysical SystemsHigh-temperature superconductorsTechniquesScanning tunneling microscopyScanning tunneling spectroscopyCondensed Matter, Materials & Applied Physics
Highlights
High-temperature superconductivity (HTS) in copper oxides is a challenging topic to understand
Scanning tunneling spectroscopy (STS) maps of vortex cores in Bi2212 were neither compatible with the discrete Caroli-de Gennes-Matricon bound states for an s-wave superconductor [3] nor with the continuum first calculated by Wang and MacDonald for a d-wave superconductor [4,5]
Instead of the expected zero-bias conductance peak (ZBCP) that splits with increasing distance from the core in the d-wave case, they revealed low-energy (E < ΔSC, where ΔSC is the superconducting gap) subgap
Summary
High-temperature superconductivity (HTS) in copper oxides is a challenging topic to understand. A number of unconventional properties, starting with their high superconducting transition temperature (Tc), have sparked sustained theoretical and experimental efforts to explain the underlying electron pairing mechanism [1,2]. The fundamental excitations bound to magnetic vortices in type-II superconductors carry information about essential properties of the superconducting state. Their proper identification is of primary interest to elucidate the mechanism driving HTS. Scanning tunneling spectroscopy (STS) maps of vortex cores in Bi2212 were neither compatible with the discrete Caroli-de Gennes-Matricon bound states for an s-wave superconductor [3] nor with the continuum first calculated by Wang and MacDonald for a d-wave superconductor [4,5]. Instead of the expected zero-bias conductance peak (ZBCP) that splits with increasing distance from the core in the d-wave case, they revealed low-energy (E < ΔSC, where ΔSC is the superconducting gap) subgap
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