Cross-over between channeling and pinning at twin boundaries in YBa2Cu3O7 thin films

Details Cross-over between channeling and pinning at twin boundaries in YBa2Cu3O7 thin films Cross-over between channeling and pinning at twin boundaries in YBa2Cu3O7 thin films

2006-07-25

arxiv.org/abs/cond-mat/0607648v1

Physics

Condensed Matter

Superconductivity

Submitted to PRL

Scientific paper

10.1103/PhysRevLett.97.257002

The critical current (Jc) of highly twinned YBa2Cu3O7 films has been measured as a function of temperature, magnetic field and angle. For much of the parameter space we observe a strong suppression of Jc for fields in the twin boundary (TB) directions; this is quantitatively modeled as flux-cutting-mediated vortex channeling. For certain temperatures and fields a cross-over occurs to a regime in which channeling is blocked and the TBs act as planar pinning centers so that TB pinning enhances the overall Jc. In this regime, intrinsic pinning along the TBs is comparable to that between the twins.

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