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Subgap states in YBa2Cu3O7-δ (Y123) are not vortex-related. These unpaired, incoherent states appear universally on the surface, even without a magnetic field, challenging previous interpretations.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Scanning tunnelling spectroscopy (STS) previously observed subgap states in Abrikosov vortex cores of YBa2Cu3O7-δ (Y123).
  • Theoretical models predicted a strong zero-bias conductance peak in vortex cores, contrasting with experimental observations.
  • The origin and nature of these subgap states in Y123 remained unclear.

Purpose of the Study:

  • To investigate the true origin of subgap features observed in YBa2Cu3O7-δ (Y123) using high-resolution scanning tunnelling spectroscopy.
  • To resolve the discrepancy between experimental observations and theoretical predictions regarding vortex core signatures.
  • To characterize the nature and spatial distribution of these subgap states in the superconducting phase.

Main Methods:

  • High-resolution scanning tunnelling spectroscopy (STS) measurements on homogeneous YBa2Cu3O7-δ (Y123) samples at 0.4 K.
  • Detailed analysis of spatial and energy reproducibility of the observed subgap features.
  • Theoretical modeling to interpret the nature of the observed states and their contribution to the tunnelling signal.

Main Results:

  • Subgap features were observed ubiquitously across the YBa2Cu3O7-δ surface, not localized to Abrikosov vortex cores.
  • These states exhibited high spatial and energy reproducibility, independent of magnetic field presence.
  • Analysis indicated that these features represent unpaired states within an incoherent tunnelling channel, distinct from the superconducting density of states.

Conclusions:

  • The previously observed subgap states in YBa2Cu3O7-δ are not intrinsically linked to Abrikosov vortices.
  • These states arise from an incoherent electronic channel present throughout the material.
  • The findings necessitate a revision of interpretations regarding electronic states in the vicinity of vortices in high-temperature superconductors.