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Observation of an emergent coherent state in the iron-based superconductor KFe2As2

Run Yang, Zhiping Yin, Yilin Wang, Yaomin Dai, Hu Miao, Bing Xu, Xianggang Qiu, and Christopher C. Homes
Phys. Rev. B 96, 201108(R) – Published 14 November 2017
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Abstract

The ab-plane optical properties of KFe2As2 single crystals have been measured over a wide temperature and frequency range. Below T*155 K, where this material undergoes an incoherent-coherent crossover, a new coherent response emerges in the optical conductivity. A spectral weight analysis suggests that this feature originates from high-energy bound states. Below 75 K the scattering rate for this feature is quadratic in temperature, indicating a Fermi-liquid response. Theoretical calculations suggest this crossover is dominated by the dxy orbital. Our results indicate Kondo-type screening is the likely mechanism for the incoherent-coherent crossover in hole-overdoped KFe2As2.

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  • Received 1 August 2017

DOI:https://doi.org/10.1103/PhysRevB.96.201108

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Run Yang1,2,3, Zhiping Yin4,*, Yilin Wang2, Yaomin Dai2, Hu Miao2, Bing Xu1, Xianggang Qiu1,3,5,†, and Christopher C. Homes2,‡

  • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 2Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 3School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
  • 4Center for Advanced Quantum Studies and Department of Physics, Beijing Normal University, Beijing 100875, China
  • 5Collaborative Innovation Center of Quantum Matter, Beijing 100084, China

  • *yinzhiping@bnu.edu.cn
  • xgqiu@iphy.ac.cn
  • homes@bnl.gov

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Issue

Vol. 96, Iss. 20 — 15 November 2017

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