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Direct observation of the energy gain underpinning ferromagnetic superexchange in the electronic structure of CrGeTe3

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CGT_v8_PRB_accepted.pdf (4.153Mb)
Date
18/05/2020
Author
Watson, Matthew D.
Marković, Igor
Mazzola, Federico
Rajan, Akhil
Morales, Edgar A.
Burn, David M.
Hesjedal, Thorsten
van der Laan, Gerrit
Mukherjee, Saumya
Kim, Timur K.
Bigi, Chiara
Vobornik, Ivana
Hatnean, Monica Ciomaga
Balakrishnan, Geetha
King, Philip D. C.
Keywords
QC Physics
TK Electrical engineering. Electronics Nuclear engineering
DAS
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Abstract
We investigate the temperature-dependent electronic structure of the van der Waals ferromagnet, CrGeTe3. Using angle-resolved photoemission spectroscopy, we identify atomic- and orbital-specific band shifts upon cooling through TC. From these, together with x-ray absorption spectroscopy and x-ray magnetic circular dichroism measurements, we identify the states created by a covalent bond between the Te 5p and the Cr eg orbitals as the primary driver of the ferromagnetic ordering in this system, while it is the Cr t2g states that carry the majority of the spin moment. The t2g states furthermore exhibit a marked bandwidth increase and a remarkable lifetime enhancement upon entering the ordered phase, pointing to a delicate interplay between localized and itinerant states in this family of layered ferromagnets.
Citation
Watson , M D , Marković , I , Mazzola , F , Rajan , A , Morales , E A , Burn , D M , Hesjedal , T , van der Laan , G , Mukherjee , S , Kim , T K , Bigi , C , Vobornik , I , Hatnean , M C , Balakrishnan , G & King , P D C 2020 , ' Direct observation of the energy gain underpinning ferromagnetic superexchange in the electronic structure of CrGeTe 3 ' , Physical Review. B, Condensed matter and materials physics , vol. 101 , 205125 .
Publication
Physical Review. B, Condensed matter and materials physics
Status
Peer reviewed
ISSN
1098-0121
Type
Journal article
Rights
Copyright © 2020 American Physical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://journals.aps.org/prb/accepted/2907eKfbZ5c1540195800b053fbcda3244f7147c3
Description
Funding: The Leverhulme Trust (Grant No. RL-2016-006), The Royal Society, and the European Research Council (Grant No. ERC-714193-QUESTDO). Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM) (I.M. and E.A.M).
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  • University of St Andrews Research
URL
https://journals.aps.org/prb/accepted/2907eKfbZ5c1540195800b053fbcda3244f7147c3
URI
http://hdl.handle.net/10023/19914

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