Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 117, Issue 27, Pages 15409-15413Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2002361117
Keywords
angle-resolved photoemission spectroscopy; quantum materials; topological materials; correlated materials
Categories
Funding
- US Department of Energy (DOE), Office of Basic Energy Science, Division of Materials Science and Engineering
- Office of Basic Energy Sciences, US DOE [DE-AC02-76SF00515]
- US DOE Office of Science User Facility [DE-AC0205CH11231]
- NSF [DMR-1157490]
- State of Florida
- Gordon and Betty Moore Foundation
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The resistance of a conventional insulator diverges as temperature approaches zero. The peculiar low-temperature resistivity satura- tion in the 4f Kondo insulator (KI) SmB6 has spurred proposals of a correlation-driven topological Kondo insulator (TKI) with exotic ground states. However, the scarcity of model TKI material families leaves difficulties in disentangling key ingredients from irrelevant details. Here we use angle-resolved photoemission spectroscopy (ARPES) to study FeSb2 , a correlated d-electron KI candidate that also exhibits a low-temperature resistivity saturation. On the (010) surface, we find a rich assemblage of metallic states with two-dimensional dispersion. Measurements of the bulk band structure reveal band renormalization, a large temperature-dependent band shift, and flat spectral features along certain high-symmetry directions, providing spectroscopic evidence for strong correlations. Our observations sug- gest that exotic insulating states resembling those in SmB6 and YbB12 may also exist in systems with d instead of f electrons.
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