Localized High Frequency Electrodynamic Behavior of Optimally-doped Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ Single Crystal films

Tamin Tai; Behnood G. Ghamsari; J. H. Kang; S. Lee; C. B. Eom; Steven M. Anlage

Localized High Frequency Electrodynamic Behavior of Optimally-doped Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ Single Crystal films

Superconductivity 2015-07-14 v1

Authors: Tamin Tai , Behnood G. Ghamsari , J. H. Kang , S. Lee , C. B. Eom , Steven M. Anlage

Abstract

Localized high frequency (several GHz) electrodynamic properties of a high quality epitaxial, single-crystal Iron-Pnicitde Ba(Fe $_{1-x}$ Co $_x$ ) $_2$ As $_2$ thin film near optimal doping (x=0.08) are measured under a localized and strong RF magnetic field, created by a near-field microwave microscope. Two reflection electrodynamic measurements, including linear and the third harmonic responses, are performed to understand the electromagnetic properties of Ba(Fe $_{1-x}$ Co $_x$ ) $_2$ As $_2$ . Our measurement results show that Ba(Fe $_{1-x}$ Co $_x$ ) $_2$ As $_2$ has have a wide superconducting transition width and may have a multi-gap nature. In addition, based on the $1/T^2$ dependence of the third harmonics signal at lower temperature, Ba(Fe $_{1-x}$ Co $_x$ ) $_2$ As $_2$ shows the possibility of nodal behavior.

Keywords

iron-pnictide superconductor Ba(Fe1-xCox)2As2 high frequency electrodynamics near-field microwave microscopy third harmonic response multi-gap superconductivity nodal behavior

Cite

@article{arxiv.1507.03318,
  title  = {Localized High Frequency Electrodynamic Behavior of Optimally-doped Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ Single Crystal films},
  author = {Tamin Tai and Behnood G. Ghamsari and J. H. Kang and S. Lee and C. B. Eom and Steven M. Anlage},
  journal= {arXiv preprint arXiv:1507.03318},
  year   = {2015}
}

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7 pages, 6 figures

Localized High Frequency Electrodynamic Behavior of Optimally-doped Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ Single Crystal films

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