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

doi:10.1063/1.3383237

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

Superconductivity 2015-05-18 v1

Authors: 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.

Keywords

high-temperature superconductivity

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@article{arxiv.1003.0132,
  title  = {Strong vortex pinning in Co-doped BaFe2As2 single crystal thin films},
  author = {C. Tarantini and S. Lee and Y. Zhang and J. Jiang and C. W. Bark and J. D. Weiss and A. Polyanskii and C. T. Nelson and H. W. Jang and C. M. Folkman and S. H. Baek and X. Q. Pan and A. Gurevich and E. E. Hellstrom and C. B. Eom and D. C. Larbalestier},
  journal= {arXiv preprint arXiv:1003.0132},
  year   = {2015}
}

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10 pages, 6 figures

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

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