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

Tarantini, C.; Lee, S.; Zhang, Y.; Jiang, J.; Bark, C. W.; Weiss, J. D.; Polyanskii, A.; Nelson, C. T.; Jang, H. W.; Folkman, C. M.; Baek, S. H.; Pan, X. Q.; Gurevich, A.; Hellstrom, E. E.; Eom, C. B.; Larbalestier, D. C.
April 2010
Applied Physics Letters;4/5/2010, Vol. 96 Issue 14, p142510
Academic Journal
We report 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 single crystals and a maximum pinning force Fp(0.6Tc)>5 GN/m3 at H/Hirr∼0.5 indicative of strong high-field vortex pinning. 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. High resolution transmission electron microscopy reveals that the strong vortex pinning is due to a high density of nanosize columnar defects.


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