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Lee S, Choi KY, Jung E, et al. Hidden non-Fermi liquid behavior caused by magnetic phase transition in Ni-doped Ba-122 pnictides. Sci Rep. 2015;5:12156doi: 10.1038/srep12156.
Lee, S., Choi, K. Y., Jung, E., Rho, S., Shin, S., Park, T., & Hwang, J. (2015). Hidden non-Fermi liquid behavior caused by magnetic phase transition in Ni-doped Ba-122 pnictides. Scientific reports, 512156. https://doi.org/10.1038/srep12156
Lee, Seokbae, et al. "Hidden non-Fermi liquid behavior caused by magnetic phase transition in Ni-doped Ba-122 pnictides." Scientific reports vol. 5 (2015): 12156. doi: https://doi.org/10.1038/srep12156
Lee S, Choi KY, Jung E, Rho S, Shin S, Park T, Hwang J. Hidden non-Fermi liquid behavior caused by magnetic phase transition in Ni-doped Ba-122 pnictides. Sci Rep. 2015 Jul 17;5:12156. doi: 10.1038/srep12156. PMID: 26184412; PMCID: PMC4505323.
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Sci Rep. 2015 Jul 17;5:12156. doi: 10.1038/srep12156.

Hidden non-Fermi liquid behavior caused by magnetic phase transition in Ni-doped Ba-122 pnictides.

Scientific reports

Seokbae Lee, Ki-Young Choi, Eilho Jung, Seulki Rho, Soohyeon Shin, Tuson Park, Jungseek Hwang

Affiliations

  1. Department of Physics, Sungkyunkwan University, Suwon, Gyeonggi-do 440-746, Republic of Korea.
  2. Center for Novel States of Complex Materials Research, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea.

PMID: 26184412 PMCID: PMC4505323 DOI: 10.1038/srep12156

Abstract

We studied two BaFe(2-x)N(I)xAs2 (Ni-doped Ba-122) single crystals at two different doping levels (underdoped and optimally doped) using an optical spectroscopic technique. The underdoped sample shows a magnetic phase transition around 80 K. We analyze the data with a Drude-Lorentz model with two Drude components (D1 and D2). It is known that the narrow D1 component originates from electron carriers in the electron-pockets and the broad D2 mode is from hole carriers in the hole-pockets. While the plasma frequencies of both Drude components and the static scattering rate of the broad D2 component show negligible temperature dependencies, the static scattering rate of the D1 mode shows strong temperature dependence for the both samples. We observed a hidden quasi-linear temperature dependence in the scattering rate of the D1 mode above and below the magnetic transition temperature while in the optimally doped sample the scattering rate shows a more quadratic temperature dependence. The hidden non-Fermi liquid behavior in the underdoped sample seems to be related to the magnetic phase of the material.

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