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arXiv · 1003.0132

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

C. Tarantini·S. Lee·Y. Zhang·J. Jiang·C. W. Bark·J. D. Weiss·A. Polyanskii·C. T. Nelson·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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Abstract

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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C. Tarantini, S. Lee, Y. Zhang, J. Jiang, C. W. Bark, J. D. Weiss, A. Polyanskii, C. T. Nelson, H. W. Jang, C. M. Folkman, S. H. Baek, X. Q. Pan, A. Gurevich, E. E. Hellstrom, C. B. Eom, D. C. Larbalestier. 2010-02-27. Strong vortex pinning in Co-doped BaFe2As2 single crystal thin films. https://doi.org/10.1063/1.3383237

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