Strong vortex pinning in Co-doped BaFe2As2 single crystal thin films

Details Strong vortex pinning in Co-doped BaFe2As2 single crystal thin films Strong vortex pinning in Co-doped BaFe2As2 single crystal thin films

2010-02-27

arxiv.org/abs/1003.0132v1

Appl. Phys. Lett. 96, 142510 (2010)

Physics

Condensed Matter

Superconductivity

10 pages, 6 figures

Scientific paper

We report measurements of the field and angular dependences of Jc of truly epitaxial Co-doped BaFe2As2 thin films grown on SrTiO3/(La,Sr)(Al,Ta)O3 with different SrTiO3 template thicknesses. The films show Jc comparable to Jc of single crystals and a maximum pinning force Fp(0.6Tc) > 5 GN/m3 at H/Hirr ~ 0.5 indicative of strong vortex pinning effective up to high fields. Due to the strong correlated c-axis pinning, Jc for field along the c-axis exceeds Jc for H//ab plane, inverting the expectation of the Hc2 anisotropy. HRTEM reveals that the strong vortex pinning is due to a high density of nanosize columnar defects.

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