Scaling behaviour of the critical current in clean epitaxial Ba(Fe1-xCox)2As2 thin films

Details Scaling behaviour of the critical current in clean epitaxial Ba(Fe1-xCox)2As2 thin films Scaling behaviour of the critical current in clean epitaxial Ba(Fe1-xCox)2As2 thin films

2010-01-14

arxiv.org/abs/1001.2505v4

Phys. Rev. B 81, 100507(R) (2010)

Physics

Condensed Matter

Superconductivity

Accepted in Physical Review B rapid communications

Scientific paper

10.1103/PhysRevB.81.100507

The angular-dependent critical current density, Jc(theta), and the upper critical field, Hc2(theta), of epitaxial Ba(Fe1-xCox)2As2 thin films have been investigated. No Jc(theta) peaks for H || c were observed regardless of temperatures and magnetic fields. In contrast, Jc(theta) showed a broad maximum at theta=90 degree, which arises from intrinsic pinning. All data except at theta=90 degree can be scaled by the Blatter plot. Hc2(theta) near Tc follows the anisotropic Ginzburg-Landau expression. The mass anisotropy increased from 1.5 to 2 with increasing temperature, which is an evidence for multi-band superconductivity.

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