Highly effective and isotropic pinning in epitaxial Fe(Se,Te) thin films grown on CaF2 substrates

V. Braccini; S. Kawale; E. Reich; E. Bellingeri; L. Pellegrino; A. Sala; M. Putti; K. Higashikawa; T. Kiss; B. Holzapfel; C. Ferdeghini

doi:10.1063/1.4826677

Highly effective and isotropic pinning in epitaxial Fe(Se,Te) thin films grown on CaF2 substrates

Superconductivity 2015-06-17 v1

Authors: V. Braccini , S. Kawale , E. Reich , E. Bellingeri , L. Pellegrino , A. Sala , M. Putti , K. Higashikawa , T. Kiss , B. Holzapfel , C. Ferdeghini

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Abstract

We report on the isotropic pinning obtained in epitaxial Fe(Se,Te) thin films grown on CaF2 (001) substrate. High critical current density values larger than 1 MA/cm2 in self field in liquid helium are reached together with a very weak dependence on the magnetic field and a complete isotropy. Analysis through Transmission Electron Microscopy evidences the presence of defects looking like lattice disorder at a very small scale, between 5 and 20 nm, which are thought to be responsible for such isotropic behavior in contrast to what observed on SrTiO3, where defects parallel to the c-axis enhance pinning in that direction

Keywords

isotropic pinning Fe(Se,Te) thin films epitaxial growth CaF2 substrate critical current density lattice disorder transmission electron microscopy

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@article{arxiv.1309.1044,
  title  = {Highly effective and isotropic pinning in epitaxial Fe(Se,Te) thin films grown on CaF2 substrates},
  author = {V. Braccini and S. Kawale and E. Reich and E. Bellingeri and L. Pellegrino and A. Sala and M. Putti and K. Higashikawa and T. Kiss and B. Holzapfel and C. Ferdeghini},
  journal= {arXiv preprint arXiv:1309.1044},
  year   = {2015}
}

Highly effective and isotropic pinning in epitaxial Fe(Se,Te) thin films grown on CaF2 substrates

Abstract

Keywords

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