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  Fermi surface of a system with strong valence fluctuations: Evidence for a noninteger count of valence electrons in EuIr2Si2

Götze, K., Bergk, B., Ignatchik, O., Polyakov, A., Kraft, I., Lorenz, V., et al. (2022). Fermi surface of a system with strong valence fluctuations: Evidence for a noninteger count of valence electrons in EuIr2Si2. Physical Review B, 105(15): 155125, pp. 1-8. doi:10.1103/PhysRevB.105.155125.

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 Creators:
Götze, K.1, Author
Bergk, B.1, Author
Ignatchik, O.1, Author
Polyakov, A.1, Author
Kraft, I.2, Author              
Lorenz, V.1, Author
Rosner, H.2, Author              
Förster, T.1, Author
Seiro, S.3, Author              
Sheikin, I.1, Author
Wosnitza, J.1, Author
Geibel, C.4, Author              
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
3Silvia Seiro, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863473              
4Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863465              

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Free keywords: Density functional theory; Electrons; Europium compounds; Fermi surface; Iridium compounds; Magnetic fields; Silicon; Silicon compounds, 4f-electrons; De Haas-van Alphen; Density-functional-theory; In-field; Lows-temperatures; Magnetic torques; Nonintegers; Temperature dependent; Valence electron; Valence fluctuations, Temperature distribution
 Abstract: We present de Haas-van Alphen (dHvA) measurements on an Eu-based valence-fluctuating system. EuIr2Si2 exhibits a temperature-dependent, noninteger europium valence with Eu2.8+ at low temperatures. The comparison of experimental results from our magnetic-Torque experiments in fields up to 32 T and density functional theory band-structure calculations with localized 4f electrons shows that the best agreement is reached for a Fermi surface based on a valence of Eu2.8+. The calculated quantum-oscillation frequencies for Eu3+ instead cannot explain all the experimentally observed frequencies. The effective masses, derived from the temperature dependence of the dHvA oscillation amplitudes, show not only a significant enhancement with masses up to 11me (me being the free electron mass), but also a magnetic-field dependence of the heaviest mass. We attribute the formation of these heavy masses to strong correlation effects resulting from valence fluctuations of 4f electrons being strongly hybridized with conduction electrons. The increase of the heavy masses with magnetic field likely results from the onset of the expected field-induced valence crossover that enhances these valence fluctuations but does not alter the Fermi-surface topology in the field range studied. © 2022 American Physical Society.

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Language(s): eng - English
 Dates: 2022-04-152022-04-15
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1103/PhysRevB.105.155125
BibTex Citekey: Götze2022
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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: 105 (15) Sequence Number: 155125 Start / End Page: 1 - 8 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008