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Title: Observation of an emergent coherent state in the iron-based superconductor KFe 2 As 2

Abstract

The ab-plane optical properties of KFe 2As 2 single crystals have been measured over a wide temperature and frequency range. Below T*≃155 K, where this material undergoes an incoherentcoherent crossover, a new coherent response emerges in the optical conductivity. A spectral weight analysis suggests that this new feature originates from high-energy bound states. Below about ≃75 K the scattering rate for this new feature is quadratic in temperature, indicating a Fermiliquid response. Theoretical calculations suggest this crossover is dominated by the d xy orbital. Our results indicate Kondo-type screening is the likely mechanism for the incoherent-coherent crossover in hole-overdoped KFe 2As 2.

Authors:
 [1];  [2];  [3];  [3];  [3];  [4];  [5];  [3]
  1. Chinese Academy of Sciences (CAS), Beijing (China); Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. of Chinese Academy of Sciences, Beijing (China)
  2. Beijing Normal Univ. (China)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Chinese Academy of Sciences (CAS), Beijing (China)
  5. Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1412751
Alternate Identifier(s):
OSTI ID: 1408795
Report Number(s):
BNL-114716-2017-JA
Journal ID: ISSN 2469-9950; PRBMDO; R&D Project: PM015; KC0207010; TRN: US1800343
Grant/Contract Number:
SC0012704
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 20; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Yang, Run, Yin, Zhiping, Wang, Yilin, Dai, Yaomin, Miao, Hu, Xu, Bing, Qiu, Xianggang, and Homes, Christopher C. Observation of an emergent coherent state in the iron-based superconductor KFe2As2. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.201108.
Yang, Run, Yin, Zhiping, Wang, Yilin, Dai, Yaomin, Miao, Hu, Xu, Bing, Qiu, Xianggang, & Homes, Christopher C. Observation of an emergent coherent state in the iron-based superconductor KFe2As2. United States. doi:10.1103/PhysRevB.96.201108.
Yang, Run, Yin, Zhiping, Wang, Yilin, Dai, Yaomin, Miao, Hu, Xu, Bing, Qiu, Xianggang, and Homes, Christopher C. Tue . "Observation of an emergent coherent state in the iron-based superconductor KFe2As2". United States. doi:10.1103/PhysRevB.96.201108.
@article{osti_1412751,
title = {Observation of an emergent coherent state in the iron-based superconductor KFe2As2},
author = {Yang, Run and Yin, Zhiping and Wang, Yilin and Dai, Yaomin and Miao, Hu and Xu, Bing and Qiu, Xianggang and Homes, Christopher C.},
abstractNote = {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 incoherentcoherent crossover, a new coherent response emerges in the optical conductivity. A spectral weight analysis suggests that this new feature originates from high-energy bound states. Below about ≃75 K the scattering rate for this new feature is quadratic in temperature, indicating a Fermiliquid 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.},
doi = {10.1103/PhysRevB.96.201108},
journal = {Physical Review B},
number = 20,
volume = 96,
place = {United States},
year = {Tue Nov 14 00:00:00 EST 2017},
month = {Tue Nov 14 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on November 14, 2018
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