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

Yang, Run; Yin, Zhiping; Wang, Yilin; Dai, Yaomin; Miao, Hu; Xu, Bing; Qiu, Xianggang; Homes, Christopher C.

doi:10.1103/PhysRevB.96.201108

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

Journal Article · Tue Nov 14 00:00:00 EST 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.96.201108· OSTI ID:1412751

Yang, Run ^[1]; Yin, Zhiping ^[2]; Wang, Yilin ^[3]; Dai, Yaomin ^[3]; Miao, Hu ^[3]; Xu, Bing ^[4]; Qiu, Xianggang ^[5]; Homes, Christopher C. ^[3]

Chinese Academy of Sciences (CAS), Beijing (China); Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. of Chinese Academy of Sciences, Beijing (China)
Beijing Normal Univ. (China)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Chinese Academy of Sciences (CAS), Beijing (China)
Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)

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 d_xy orbital. Our results indicate Kondo-type screening is the likely mechanism for the incoherent-coherent crossover in hole-overdoped KFe₂As₂.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 1412751

Alternate ID(s):: OSTI ID: 1408795

Report Number(s):: BNL-114716-2017-JA; PRBMDO; R&D Project: PM015; KC0207010; TRN: US1800343

Journal Information:: Physical Review B, Vol. 96, Issue 20; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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