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

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Seiro,  Silvia
Silvia Seiro, Physics of Quantum Materials, 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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Rosner,  Helge
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Cardoso Gill,  Raúl
Raul Cardoso, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Geibel,  Christoph
Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

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.


Cite as: http://hdl.handle.net/21.11116/0000-0003-B23E-F
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.