Nonrigid band shift and nonmonotonic electronic structure changes upon doping in the normal state of the pnictide high-temperature superconductor Ba(Fe1-xCox)2As2

Vilmercati, Paolo; Mo, Sung -Kwan; Fedorov, Alexei; McGuire, Michael A.; Sefat, Athena Safa; Sales, Brian C.; Mandrus, David; Singh, David J.; Ku, Wei; Johnston, Steve; Mannella, Norman

doi:10.1103/PhysRevB.94.195147

Title: Nonrigid band shift and nonmonotonic electronic structure changes upon doping in the normal state of the pnictide high-temperature superconductor $Ba {(F e_{1 - x} C o_{x})}_{2} A s_{2}$

Journal Article · Mon Nov 28 00:00:00 EST 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.94.195147· OSTI ID:1334493

Vilmercati, Paolo ^[1]; Mo, Sung -Kwan ^[2]; Fedorov, Alexei ^[2]; McGuire, Michael A. ^[3]; Sefat, Athena Safa ^[3]; Sales, Brian C. ^[3]; Mandrus, David ^[4]; Singh, David J. ^[5]; Ku, Wei ^[6]; Johnston, Steve ^[1]; Mannella, Norman ^[7]

Univ. of Tennessee, Knoxville, TN (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Missouri, Columbia, MO (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States); State Univ. of New York, Stony Brook, NY (United States)
Univ. of Tennessee, Knoxville, TN (United States); Shanghai Jiao Tong Univ., Shanghai (China)

© 2016 American Physical Society. We report systematic angle-resolved photoemission (ARPES) experiments using different photon polarizations and experimental geometries and find that the doping evolution of the normal state of Ba(Fe1-xCox)2As2 deviates significantly from the predictions of a rigid band model. The data reveal a nonmonotonic dependence upon doping of key quantities such as band filling, bandwidth of the electron pocket, and quasiparticle coherence. Our analysis suggests that the observed phenomenology and the inapplicability of the rigid band model in Co-doped Ba122 are due to electronic correlations, and not to the either the strength of the impurity potential, or self-energy effects due to impurity scattering. Our findings indicate that the effects of doping in pnictides are much more complicated than currently believed. More generally, they indicate that a deep understanding of the evolution of the electronic properties of the normal state, which requires an understanding of the doping process, remains elusive even for the 122 iron-pnictides, which are viewed as the least correlated of the high-TC unconventional superconductors.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

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

Grant/Contract Number:: AC05-00OR22725; AC02-05CH11231

OSTI ID:: 1334493

Alternate ID(s):: OSTI ID: 1333605; OSTI ID: 1398443

Journal Information:: Physical Review B, Vol. 94, Issue 19; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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Effect of electron doping in FeTe$_{1-y}$Se$_{y}$ realized by Co and Ni substitution Rosmus, M.; Kurleto, R.; Gawryluk, D. J. arXiv https://doi.org/10.48550/arxiv.1910.12530	text	January 2019

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Title: Nonrigid band shift and nonmonotonic electronic structure changes upon doping in the normal state of the pnictide high-temperature superconductor $Ba {(F e_{1 - x} C o_{x})}_{2} A s_{2}$