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26 April 2024

» arxiv » 1003.0132

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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 ;
Date:	27 Feb 2010
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.
Source:	arXiv, 1003.0132
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