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

Watson, M. D., Marković, I., Mazzola, F., Rajan, A., Morales, E. A., Burn, D. M., et al. (2020). Direct observation of the energy gain underpinning ferromagnetic superexchange in the electronic structure of CrGeTe3. Physical Review B, 101(20): 205125, pp. 1-7. doi:10.1103/PhysRevB.101.205125.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-89F9-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-8B66-B
Genre: Journal Article

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 Creators:
Watson, Matthew D.1, Author
Marković, Igor2, Author              
Mazzola, Federico1, Author
Rajan, Akhil1, Author
Morales, Edgar A.2, Author              
Burn, David M.1, Author
Hesjedal, Thorsten1, Author
van der Laan, Gerrit1, Author
Mukherjee, Saumya1, Author
Kim, Timur K.1, Author
Bigi, Chiara1, Author
Vobornik, Ivana1, Author
Hatnean, Monica Ciomaga1, Author
Balakrishnan, Geetha1, Author
King, Philip D. C.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              

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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 T-c. 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 e(g) orbitals as the primary driver of the ferromagnetic ordering in this system, while it is the Cr t(2g) states that carry the majority of the spin moment. The t(2g) 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.

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Language(s): eng - English
 Dates: 2020-05-182020-05-18
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 101 (20) Sequence Number: 205125 Start / End Page: 1 - 7 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008