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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 Lab. (BNL), Upton, NY (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)
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:
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. https://www.osti.gov/servlets/purl/1412751.
@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 = {2017},
month = {11}
}

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Works referenced in this record:

Mott transition in multiorbital models for iron pnictides
journal, December 2011


Selective Mott Physics as a Key to Iron Superconductors
journal, April 2014


Observation of universal strong orbital-dependent correlation effects in iron chalcogenides
journal, July 2015

  • Yi, M.; Liu, Z-K; Zhang, Y.
  • Nature Communications, Vol. 6, Issue 1
  • DOI: 10.1038/ncomms8777

High energy pseudogap and its evolution with doping in Fe-based superconductors as revealed by optical spectroscopy
journal, July 2012


Hidden T -Linear Scattering Rate in Ba 0.6 K 0.4 Fe 2 As 2 Revealed by Optical Spectroscopy
journal, September 2013


Iron-based high transition temperature superconductors
journal, July 2014

  • Chen, Xianhui; Dai, Pengcheng; Feng, Donglai
  • National Science Review, Vol. 1, Issue 3
  • DOI: 10.1093/nsr/nwu007

Contrasting Spin Dynamics between Underdoped and Overdoped Ba ( Fe 1 x Co x ) 2 As 2
journal, January 2010


Magnetism and charge dynamics in iron pnictides
journal, February 2011

  • Yin, Z. P.; Haule, K.; Kotliar, G.
  • Nature Physics, Vol. 7, Issue 4
  • DOI: 10.1038/nphys1923

Orbital Selective Spin Excitations and their Impact on Superconductivity of LiFe 1 x Co x As
journal, June 2016


Dynamical Mean-Field Theory Plus Numerical Renormalization-Group Study of Spin-Orbital Separation in a Three-Band Hund Metal
journal, September 2015


Orbital Selective Fermi Surface Shifts and Mechanism of High T c Superconductivity in Correlated A FeAs ( A = Li , Na)
journal, October 2012


Electronic correlations in Hund metals
journal, August 2015


Fermi surface in KFe 2 As 2 determined via de Haas–van Alphen oscillation measurements
journal, June 2013


Kinetic frustration and the nature of the magnetic and paramagnetic states in iron pnictides and iron chalcogenides
journal, September 2011

  • Yin, Z. P.; Haule, K.; Kotliar, G.
  • Nature Materials, Vol. 10, Issue 12
  • DOI: 10.1038/nmat3120

Quantum Criticality and Nodal Superconductivity in the FeAs-Based Superconductor KFe 2 As 2
journal, February 2010


Band Structure and Fermi Surface of an Extremely Overdoped Iron-Based Superconductor KFe 2 As 2
journal, July 2009


Technique for measuring the reflectance of irregular, submillimeter-sized samples
journal, January 1993

  • Homes, Christopher C.; Reedyk, M.; Cradles, D. A.
  • Applied Optics, Vol. 32, Issue 16
  • DOI: 10.1364/AO.32.002976

Janus-Faced Influence of Hund’s Rule Coupling in Strongly Correlated Materials
journal, December 2011


Strong correlations, strong coupling, and s -wave superconductivity in hole-doped BaFe 2 As 2 single crystals
journal, November 2016


Spin-Fluctuation-Induced Non-Fermi-Liquid Behavior with Suppressed Superconductivity in LiFe 1 x Co x As
journal, September 2015


Analytic theory of Hund's metals: A renormalization group perspective
journal, January 2015


Strong Correlations from Hund’s Coupling
journal, April 2013


Spectral weight transfer in strongly correlated Fe 1.03 Te
journal, September 2014


Coherence-Incoherence Crossover and the Mass-Renormalization Puzzles in Sr 2 RuO 4
journal, March 2011


Optical investigations of the normal and superconducting states reveal two electronic subsystems in iron pnictides
journal, March 2010


Dynamical mean-field theory within the full-potential methods: Electronic structure of CeIrIn 5 , CeCoIn 5 , and CeRhIn 5
journal, May 2010


Ferro-Orbital Ordering Transition in Iron Telluride Fe 1 + y Te
journal, May 2014


Orbital-differentiated coherence-incoherence crossover identified by photoemission spectroscopy in LiFeAs
journal, November 2016


Mott Transition in VO2 Revealed by Infrared Spectroscopy and Nano-Imaging
journal, December 2007


Electronic correlations in the iron pnictides
journal, July 2009

  • Qazilbash, M. M.; Hamlin, J. J.; Baumbach, R. E.
  • Nature Physics, Vol. 5, Issue 9
  • DOI: 10.1038/nphys1343

Coherence–incoherence crossover in the normal state of iron oxypnictides and importance of Hund's rule coupling
journal, February 2009


Evidence of Strong Correlations and Coherence-Incoherence Crossover in the Iron Pnictide Superconductor KFe 2 As 2
journal, July 2013


Specific heat in KFe 2 As 2 in zero and applied magnetic field
journal, May 2011


Electronic structure of the iron-based superconductor LaOFeP
journal, September 2008


Microscopic nature of correlations in multiorbital A Fe 2 As 2 ( A = K , Rb , Cs ) : Hund's coupling versus Coulomb repulsion
journal, November 2015


Coherent-to-incoherent crossover in the optical conductivity of La 2 x Sr x CuO 4 : Charge dynamics of a bad metal
journal, February 2002


Strain-Driven Approach to Quantum Criticality in A Fe 2 As 2 with A = K , Rb, and Cs
journal, June 2016


Satellites and large doping and temperature dependence of electronic properties in hole-doped BaFe2As2
journal, March 2012

  • Werner, Philipp; Casula, Michele; Miyake, Takashi
  • Nature Physics, Vol. 8, Issue 4
  • DOI: 10.1038/nphys2250