Journal
SCIENCE
Volume 362, Issue 6410, Pages 65-68Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aap9607
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Funding
- National Science Foundation [DMR-1707620, DMR-1644779, DMR-1157490]
- Office of Naval Research through the Young Investigator Prize [N00014-15-1-2382]
- Japan Society for the Promotion of Science (JSPS) [25220710, 15H02106, 15H03688, 16K05460, 16K13837, 18H01180, 18H05227, 15H05852]
- National Science Foundation Major Research Instrumentation [DMR-1428226]
- U.S. Department of Energy (DOE) [DE-SC0008110]
- DOE
- state of Florida
- DOE BES Program Science in 100 T
- QuantEmX grant from the Institute for Complex Adaptive Matter
- Gordon and Betty Moore Foundation [GBMF5305]
- Nakajima Foundation
- National Science Foundation Graduate Research Fellowship [F031543]
- National Science Foundation East Asia and Pacific Summer Institute Fellowship [1614138]
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In metals, orbital motions of conduction electrons on the Fermi surface are quantized in magnetic fields, which is manifested by quantum oscillations in electrical resistivity. This Landau quantization is generally absent in insulators. Here, we report a notable exception in an insulator-ytterbium dodecaboride (YbB12). The resistivity of YbB12, which is of a much larger magnitude than the resistivity in metals, exhibits distinct quantum oscillations. These unconventional oscillations arise from the insulating bulk, even though the temperature dependence of the oscillation amplitude follows the conventional Fermi liquid theory of metals with a large effective mass. Quantum oscillations in the magnetic torque are also observed, albeit with a lighter effective mass.
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