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Charge, lattice and magnetism across the valence crossover in EuIr2Si2 single crystals.

08:00 EDT 1st April 2019 | BioPortfolio

Summary of "Charge, lattice and magnetism across the valence crossover in EuIr2Si2 single crystals."

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 EuIr<sub>2</sub>Si<sub>2</sub>. A comparison to stable-valent isostructural compounds EuCo<sub>2</sub>Si<sub>2</sub> (with Eu<sup>3+</sup>), and EuRh<sub>2</sub>Si<sub>2</sub>, (with Eu<sup>2+</sup>) reveals an anomalously large thermal expansion indicative of the lattice softening associated to valence fluctuations. A marked broad peak at temperatures around 65-75K 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 EuIr<sub>2</sub>Si<sub>2</sub>. with a single set of parameters.

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This article was published in the following journal.

Name: Journal of physics. Condensed matter : an Institute of Physics journal
ISSN: 1361-648X
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