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f-electron hybridised Fermi surface in magnetic field-induced metallic YbB12

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Liu, H., Hickey, A. J., Hartstein, M., Davies, A. J., Eaton, A. G., Elvin, T., Polyakov, E., Vu, T. H., Wichitwechkarn, V., Förster, T., Wosnitza, J., Murphy, T. P., Shitsevalova, N., Johannes, M. D., Hatnean, Monica Ciomaga, Balakrishnan, Geetha, Lonzarich, G. G. and Sebastian, Suchitra E. (2022) f-electron hybridised Fermi surface in magnetic field-induced metallic YbB12. npj Quantum Materials, 7 (1). 12. doi:10.1038/s41535-021-00413-7

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Official URL: http://dx.doi.org/10.1038/s41535-021-00413-7

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Abstract

The nature of the Fermi surface observed in the recently discovered family of unconventional insulators starting with SmB6 is a subject of intense inquiry. Here we shed light on this question by accessing quantum oscillations in the high magnetic fieldinduced metallic regime above ≈47 T in YbB12, which we compare with the unconventional insulating regime. In the field-induced metallic regime, we find prominent quantum oscillations in the electrical resistivity characterised by multiple frequencies and heavy effective masses. The close similarity in Lifshitz-Kosevich low-temperature growth of quantum oscillation amplitude in insulating YbB12 to field-induced metallic YbB12, points to an origin of quantum oscillations in insulating YbB12 from in-gap neutral low energy excitations. Higher frequency Fermi surface sheets of heavy quasiparticle effective mass emerge in the field-induced metallic regime of YbB12 in addition to multiple heavy Fermi surface sheets observed in both insulating and metallic regimes. f-electron hybridisation is thus observed to persist from the unconventional insulating to the field-induced metallic regime of YbB12, in contrast to the unhybridised conduction electron Fermi surface observed in unconventional insulating SmB6. Our findings thus require an alternative model for YbB12, of neutral in-gap low energy excitations, wherein the f-electron hybridisation is retained.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Fermi surfaces , Electrons , Kondo effect , Magnetism, Band theory of, Free electron theory of metals
Journal or Publication Title: npj Quantum Materials
Publisher: Springer Nature Ltd
ISSN: 2397-4648
Official Date: 21 January 2022
Dates:
DateEvent
21 January 2022Published
10 December 2021Accepted
2 March 2021Submitted
Volume: 7
Number: 1
Article Number: 12
DOI: 10.1038/s41535-021-00413-7
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
Copyright Holders: The Authors
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
EP/T005963/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EP/M506485/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EP/P024947/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EP/1805236[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EP/2124504[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
UNSPECIFIEDRoyal Societyhttp://dx.doi.org/10.13039/501100000288
Philip Leverhulme PrizeLeverhulme Trusthttp://dx.doi.org/10.13039/501100000275
Winton Programme for the Physics of SustainabilityUniversity of Cambridge.‏ ‎Department of Physicshttp://viaf.org/viaf/305307816
UNSPECIFIEDTaiwan. Ministry of Educationhttp://viaf.org/viaf/159656457
M19-1108Royal Society of Chemistryhttp://dx.doi.org/10.13039/501100000704
337425 Seventh Framework Programmehttp://dx.doi.org/10.13039/100011102
772891Seventh Framework Programmehttp://dx.doi.org/10.13039/100011102
UNSPECIFIEDOffice of Naval Researchhttp://dx.doi.org/10.13039/100000006
EP/M000524/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
390858490[DFG] Deutsche Forschungsgemeinschafthttp://dx.doi.org/10.13039/501100001659
DMR-1157490[NSF] National Science Foundation (US)http://dx.doi.org/10.13039/100000001
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