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  Charge, lattice and magnetism across the valence crossover in Eulr2Si2 single crystals

Seiro, S., Prots, Y., Kummer, K., Rosner, H., Cardoso Gill, R., & Geibel, C. (2019). Charge, lattice and magnetism across the valence crossover in Eulr2Si2 single crystals. Journal of Physics: Condensed Matter, 31(30): 305602, pp. 1-7. doi:10.1088/1361-648X/ab1509.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-B23E-F Version Permalink: http://hdl.handle.net/21.11116/0000-0003-B240-B
Genre: Journal Article

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 Creators:
Seiro, Silvia1, Author              
Prots, Yurii2, Author              
Kummer, Kurt3, Author
Rosner, Helge4, Author              
Cardoso Gill, Raúl5, Author              
Geibel, Christoph6, Author              
Affiliations:
1Silvia Seiro, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863473              
2Yuri Prots, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863424              
3External Organizations, ou_persistent22              
4Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
5Raul Cardoso, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863420              
6Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863465              

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 Abstract: We present a detailed study of the temperature evolution of the crystal structure, specific heat, magnetic susceptibility and resistivity of single crystals of the paradigmatic valence fluctuating compound EuIr2Si2. A comparison to stable-valent isostructural compounds EuCo2Si2 (with Eu3+), and EuRh2Si2, (with Eu2+) reveals an anomalously large thermal expansion indicative of the lattice softening associated to valence fluctuations. A marked broad peak at temperatures around 65-75 K is observed in specific heat, susceptibility and the derivative of resistivity, as thermal energy becomes large enough to excite Eu into a divalent state, which localizes one f electron and increases scattering of conduction electrons. In addition, the intermediate valence at low temperatures manifests in a moderately renormalized electron mass, with enhanced values of the Sommerfeld coefficient in the specific heat and a Fermi-liquid-like dependence of resistivity at low temperatures. The high residual magnetic susceptibility is mainly ascribed to a Van Vleck contribution. Although the intermediate/ fluctuating valence duality is to some extent represented in the interconfiguration fluctuation model commonly used to analyze data on valence-fluctuating systems, we show that this model cannot describe the different physical properties of EuIr2Si2 with a single set of parameters.

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Language(s): eng - English
 Dates: 2019-05-132019-05-13
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000467823800002
DOI: 10.1088/1361-648X/ab1509
 Degree: -

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Title: Journal of Physics: Condensed Matter
  Abbreviation : J. Phys. Condens. Matter.
Source Genre: Journal
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Publ. Info: Bristol : IOP Publishing
Pages: - Volume / Issue: 31 (30) Sequence Number: 305602 Start / End Page: 1 - 7 Identifier: ISSN: 0953-8984
CoNE: https://pure.mpg.de/cone/journals/resource/954928562478