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Journal Article

Intermediate Valence Behavior of Yb2Cu9Al8

MPS-Authors
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Juckel,  Martin
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Koželj,  Primož
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Prots,  Yurii
Yuri Prots, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Ormeci,  Alim
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Burkhardt,  Ulrich
Ulrich Burkhardt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Leithe-Jasper,  Andreas
Andreas Leithe-Jasper, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Svanidze,  Eteri
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Juckel, M., Koželj, P., Prots, Y., Ormeci, A., Burkhardt, U., Leithe-Jasper, A., et al. (2020). Intermediate Valence Behavior of Yb2Cu9Al8. Zeitschrift für anorganische und allgemeine Chemie, 646, 1238-1243. doi:10.1002/zaac.202000118.


Cite as: https://hdl.handle.net/21.11116/0000-0006-89AF-B
Abstract
Intermediate valence behavior is frequently observed in materials containing Ce, Yb, Eu, Sm, or Tm. In the current work, we report synthesis and characterization of Yb2Cu9Al8 (Th2Zn17 structure type). Its intermediate valence behavior can be described by an excitation energy Eex/kB = 319 K and a spin fluctuation temperature Tsf = 60 K. The valence state of Yb is estimated to be close to 2.04 for the low-temperature region. The valence gradually evolves to the value of 2.80 at T = 400 K. The specific heat coefficient of γexp = 59 mJ·molYb –1·K–2 indicates a moderate effective mass enhancement, together with finite density of states at the Fermi level. The latter is also confirmed by the band structure calculations. © 2020 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.