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

paper

Localized High Frequency Electrodynamic Behavior of Optimally-doped Ba(Fe $_{1 - x}$ Co $_{x}$ ) $_{2}$ As $_{2}$ Single Crystal films

arXiv:1507.03318

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.

arXiv comment7 pages, 6 figures

Localized High Frequency Electrodynamic Behavior of Optimally-doped Ba(Fe1−x​Cox​)2​As2​ Single Crystal films

Abstract

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Localized High Frequency Electrodynamic Behavior of Optimally-doped Ba(Fe $_{1 - x}$ Co $_{x}$ ) $_{2}$ As $_{2}$ Single Crystal films