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Insight into the Temperature Evolution of Electronic Structure and Mechanism of Exchange Interaction in EuS

Fedorov, A. V. ; Poelchen, G. ; Eremeev, S. V. ; Schulz, S. ; Generalov, A. LU ; Polley, C. LU ; Laubschat, C. ; Kliemt, K. ; Kaya, N. and Krellner, C. , et al. (2021) In Journal of Physical Chemistry Letters 12(34). p.8328-8334
Abstract

Discovered in 1962, the divalent ferromagnetic semiconductor EuS (TC = 16.5 K, Eg = 1.65 eV) has remained constantly relevant to the engineering of novel magnetically active interfaces, heterostructures, and multilayer sequences and to combination with topological materials. Because detailed information on the electronic structure of EuS and, in particular, its evolution across TC is not well-represented in the literature but is essential for the development of new functional systems, the present work aims at filling this gap. Our angle-resolved photoemission measurements complemented with first-principles calculations demonstrate how the electronic structure of EuS evolves across a paramagnetic-ferromagnetic transition. Our results... (More)

Discovered in 1962, the divalent ferromagnetic semiconductor EuS (TC = 16.5 K, Eg = 1.65 eV) has remained constantly relevant to the engineering of novel magnetically active interfaces, heterostructures, and multilayer sequences and to combination with topological materials. Because detailed information on the electronic structure of EuS and, in particular, its evolution across TC is not well-represented in the literature but is essential for the development of new functional systems, the present work aims at filling this gap. Our angle-resolved photoemission measurements complemented with first-principles calculations demonstrate how the electronic structure of EuS evolves across a paramagnetic-ferromagnetic transition. Our results emphasize the importance of the strong Eu 4f-S 3p mixing for exchange-magnetic splittings of the sulfur-derived bands as well as coupling between f and d orbitals of neighboring Eu atoms to derive the value of TC accurately. The 4f-3p mixing facilitates the coupling between 4f and 5d orbitals of neighboring Eu atoms, which mainly governs the exchange interaction in EuS.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry Letters
volume
12
issue
34
pages
7 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85114597659
  • pmid:34428055
ISSN
1948-7185
DOI
10.1021/acs.jpclett.1c02274
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2021 American Chemical Society.
id
3f6b94b4-08d3-4500-9f3b-b7083ac3fb41
date added to LUP
2021-10-18 15:52:15
date last changed
2025-01-13 15:28:03
@article{3f6b94b4-08d3-4500-9f3b-b7083ac3fb41,
  abstract     = {{<p>Discovered in 1962, the divalent ferromagnetic semiconductor EuS (TC = 16.5 K, Eg = 1.65 eV) has remained constantly relevant to the engineering of novel magnetically active interfaces, heterostructures, and multilayer sequences and to combination with topological materials. Because detailed information on the electronic structure of EuS and, in particular, its evolution across TC is not well-represented in the literature but is essential for the development of new functional systems, the present work aims at filling this gap. Our angle-resolved photoemission measurements complemented with first-principles calculations demonstrate how the electronic structure of EuS evolves across a paramagnetic-ferromagnetic transition. Our results emphasize the importance of the strong Eu 4f-S 3p mixing for exchange-magnetic splittings of the sulfur-derived bands as well as coupling between f and d orbitals of neighboring Eu atoms to derive the value of TC accurately. The 4f-3p mixing facilitates the coupling between 4f and 5d orbitals of neighboring Eu atoms, which mainly governs the exchange interaction in EuS. </p>}},
  author       = {{Fedorov, A. V. and Poelchen, G. and Eremeev, S. V. and Schulz, S. and Generalov, A. and Polley, C. and Laubschat, C. and Kliemt, K. and Kaya, N. and Krellner, C. and Chulkov, E. V. and Kummer, K. and Usachov, D. Yu and Ernst, A. and Vyalikh, D. V.}},
  issn         = {{1948-7185}},
  language     = {{eng}},
  month        = {{09}},
  number       = {{34}},
  pages        = {{8328--8334}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Journal of Physical Chemistry Letters}},
  title        = {{Insight into the Temperature Evolution of Electronic Structure and Mechanism of Exchange Interaction in EuS}},
  url          = {{http://dx.doi.org/10.1021/acs.jpclett.1c02274}},
  doi          = {{10.1021/acs.jpclett.1c02274}},
  volume       = {{12}},
  year         = {{2021}},
}