Role of CuO chains in vortex core structure in YBa2Cu3O{7-delta}

TL;DR

This study uses Bogoliubov-deGennes equations to model how CuO chains affect vortex core structures in YBa2Cu3O7-delta, explaining experimentally observed vortex core contraction at low fields.

Contribution

It introduces a proximity model that explicitly incorporates CuO chains, revealing their role in vortex core contraction in high-temperature superconductor YBa2Cu3O7-delta.

Findings

CuO chains cause vortex core contraction at low magnetic fields.

The model explains the experimentally observed rapid vortex core shrinking.

Chains influence the local electronic structure within vortex cores.

Abstract

The Bogoliubov-deGennes equations are solved for a proximity model for YBa_2Cu_3O_{7-\delta} in a magnetic field. The model explicitly includes the effects of the one-dimensional CuO chains, whose influence on the vortex core structure is studied. The rapid vortex core contraction as a function of field which is seen experimentally at low magnetic fields is naturally explained by the presence of the chains.