Strongly correlated electron behaviour in the compound CeRhSn

A. Ṡlebarski Department of Physics and Institute for Pure and Applied Physical Sciences, University of California, San Diego,La Jolla, California, 92093-0360, USA; Institute of Physics, University of Silesia, 40-007 Katowice, Poland

M. B. Maple Department of Physics and Institute for Pure and Applied Physical Sciences, University of California, San Diego,La Jolla, California, 92093-0360, USA

E. J. Freeman Department of Physics and Institute for Pure and Applied Physical Sciences, University of California, San Diego,La Jolla, California, 92093-0360, USA

C. Sirvent Department of Physics and Institute for Pure and Applied Physical Sciences, University of California, San Diego,La Jolla, California, 92093-0360, USA

M. Radlowska Institute of Physics, University of Silesia, 40-007 Katowice, Poland

A. Jezierski Institute of Molecular Physics, Polish Academy of Sciences, 60-179 Poznań, Poland

E. Granado NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland, 20899, USA; Center for Superconductivity Research, University of Maryland, College Park, Maryland, 20742, USA

Q. Huang NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland, 20899, USA; Materials Research Program, University of Maryland, College Park, Maryland, 20742, USA

J. W. Lynn NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland, 20899, USA; Center for Superconductivity Research, University of Maryland, College Park, Maryland, 20742, USA

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Abstract

Electrical resistivity ρ, magnetic susceptibility χ, specific heat C, X-ray photoelectron spectroscopy (XPS) and X-ray and neutron diffraction measurements were made on the compound CeRhSn. The measurements reveal an enhancement of the electronic specific heat coefficient γ = C(T)/T ≈ 160 mJ mol⁻¹ K⁻² at about 1 K and non-Fermi-liquid-like temperature dependences ρ(T) α T ^0.75 and χ(T) α T ^−0.5 at low temperatures. At high temperatures, the physical properties indicate Kondo-intermediate-valence behaviour. The XPS measurements are consistent with a Ce valence of 3.07. The neutron diffraction measurements reveal anomalies in the planar Ce-Rh and Ce-Ce bond distances in the vicinity of 100 K which are apparently associated with the Ce valence instability in CeRhSn.

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Strongly correlated electron behaviour in the compound CeRhSn

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Strongly correlated electron behaviour in the compound CeRhSn

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