Koitzsch, Andreas, Mueller, Eric, Knupfer, Martin, Buchner, Bernd, Nowak, Domenic, Isaeva, Anna, Doert, Thomas, Grueninger, Markus, Nishimoto, Satoshi and van den Brink, Jeroen (2020). Low-temperature enhancement of ferromagnetic Kitaev correlations in alpha-RuCl3. Phys. Rev. Mater., 4 (9). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2475-9953

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Abstract

Kitaev-type interactions between neighboring magnetic moments emerge in the honeycomb material alpha-RuCl3. It is debated, however, whether these Kitaev interactions are ferromagnetic or antiferromagnetic. With electron energy loss spectroscopy (EELS) we study the lowest excitation across the Mott-Hubbard gap, which involves a d(4) triplet in the final state and therefore is sensitive to nearest-neighbor spin-spin correlations. At low temperatures the spectral weight of these triplets is strongly enhanced, in accordance with optical data. We show that the magnetic correlation function that determines this EELS spectral weight is directly related to a Kitaev-type spin-spin correlator and that the temperature dependence agrees very well with the results of a microscopic magnetic Hamiltonian for alpha-RuCl3 with ferromagnetic Kitaev coupling.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Koitzsch, AndreasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mueller, EricUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Knupfer, MartinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Buchner, BerndUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nowak, DomenicUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Isaeva, AnnaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Doert, ThomasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Grueninger, MarkusUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nishimoto, SatoshiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
van den Brink, JeroenUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-319049
DOI: 10.1103/PhysRevMaterials.4.094408
Journal or Publication Title: Phys. Rev. Mater.
Volume: 4
Number: 9
Date: 2020
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 2475-9953
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
Materials Science, MultidisciplinaryMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/31904

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