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Valence fluctuations in the 3D+3 modulated Yb3Co4Ge13 Remeika phase

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Feig,  Manuel
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Akselrud,  Lev
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Bobnar,  Matej
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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Gumeniuk,  Roman
Roman Gumeniuk, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Feig, M., Akselrud, L., Motylenko, M., Bobnar, M., Wagler, J., Kvashnina, K. O., et al. (2021). Valence fluctuations in the 3D+3 modulated Yb3Co4Ge13 Remeika phase. Dalton Transactions, 50, 13580-13590. doi:10.1039/d1dt01972d.


Cite as: http://hdl.handle.net/21.11116/0000-0009-42BA-B
Abstract
Yb3Co4Ge13 is the first example of a Remeika phase with a 3D + 3 [space group P43n(alpha,0,0)000(0,alpha,0)000(0,0,alpha)000; a = 8.72328(1) angstrom, alpha = 0.4974(2)] modulated crystal structure. A slight shift of the composition towards higher Yb-content (i.e. Yb3.2Co4Ge12.8) leads to the disappearance of the satellite reflections and stabilization of the disordered primitive cubic [space group Pm3n, a = 8.74072(2) angstrom] Remeika prototype structure. The stoichiometric structurally modulated germanide is a metal with hole-like charge carriers, where Yb-ions are in a temperature-dependent intermediate valence state varying from +2.60 to +2.66 for the temperature range 85-293 K. The valence fluctuations have been investigated by means of temperature dependent X-ray absorption spectroscopy, magnetic susceptibility and thermopower measurements.