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

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arxiv 1003.0132 v1 pith:LQ2HOTHC submitted 2010-02-27 cond-mat.supr-con

C. Tarantini , S. Lee , Y. Zhang , J. Jiang , C. W. Bark , J. D. Weiss , A. Polyanskii , C. T. Nelson
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H. W. Jang C. M. Folkman S. H. Baek X. Q. Pan A. Gurevich E. E. Hellstrom C. B. Eom D. C. Larbalestier
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keywords pinningstrongfilmsvortexbafe2as2c-axisco-dopedfield
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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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