TY - JOUR
T1 - Electronic correlations in the semiconducting half-Heusler compound FeVSb
AU - Shourov, Estiaque H.
AU - Strohbeen, Patrick J.
AU - Du, Dongxue
AU - Sharan, Abhishek
AU - De Lima, Felipe C.
AU - Rodolakis, Fanny
AU - McChesney, Jessica L.
AU - Yannello, Vincent
AU - Janotti, Anderson
AU - Birol, Turan
AU - Kawasaki, Jason K.
N1 - Publisher Copyright:
© 2021 American Physical Society.
PY - 2021/1/25
Y1 - 2021/1/25
N2 - Electronic correlations are crucial to the low-energy physics of metallic systems with localized d and f states; however, their effect on band insulators and semiconductors is typically negligible. Here, we measure the electronic structure of the half-Heusler compound FeVSb, a band insulator with a filled shell configuration of 18 valence electrons per formula unit (s2p6d10). Angle-resolved photoemission spectroscopy reveals a mass renormalization of m∗/mbare=1.4, where m∗ is the measured effective mass and mbare is the mass from density functional theory calculations with no added on-site Coulomb repulsion. Our measurements are in quantitative agreement with dynamical mean-field theory calculations, highlighting the many-body origin of the mass renormalization. This mass renormalization lies in dramatic contrast to other filled shell intermetallics, including the thermoelectric materials CoTiSb and NiTiSn, and has a similar origin to that in FeSi, where Hund's coupling induced fluctuations across the gap can explain a dynamical self-energy and correlations. Our work calls for a rethinking of the role of correlations and Hund's coupling in intermetallic band insulators.
AB - Electronic correlations are crucial to the low-energy physics of metallic systems with localized d and f states; however, their effect on band insulators and semiconductors is typically negligible. Here, we measure the electronic structure of the half-Heusler compound FeVSb, a band insulator with a filled shell configuration of 18 valence electrons per formula unit (s2p6d10). Angle-resolved photoemission spectroscopy reveals a mass renormalization of m∗/mbare=1.4, where m∗ is the measured effective mass and mbare is the mass from density functional theory calculations with no added on-site Coulomb repulsion. Our measurements are in quantitative agreement with dynamical mean-field theory calculations, highlighting the many-body origin of the mass renormalization. This mass renormalization lies in dramatic contrast to other filled shell intermetallics, including the thermoelectric materials CoTiSb and NiTiSn, and has a similar origin to that in FeSi, where Hund's coupling induced fluctuations across the gap can explain a dynamical self-energy and correlations. Our work calls for a rethinking of the role of correlations and Hund's coupling in intermetallic band insulators.
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U2 - 10.1103/PhysRevB.103.045134
DO - 10.1103/PhysRevB.103.045134
M3 - Article
AN - SCOPUS:85100317548
SN - 2469-9950
VL - 103
JO - Physical Review B
JF - Physical Review B
IS - 4
M1 - 045134
ER -