Kondo lattice heavy fermion behavior in CeRh2Ga2

V K Anand; D T Adroja; A Bhattacharyya; B Klemke; B Lake

doi:10.1088/1361-648X/aa5b5d

Kondo lattice heavy fermion behavior in CeRh₂Ga₂

J Phys Condens Matter. 2017 Apr 5;29(13):135601. doi: 10.1088/1361-648X/aa5b5d. Epub 2017 Jan 31.

Authors

V K Anand¹, D T Adroja, A Bhattacharyya, B Klemke, B Lake

Affiliation

¹ Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner Platz 1, D-14109 Berlin, Germany. ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, United Kingdom.

PMID: 28140348
DOI: 10.1088/1361-648X/aa5b5d

Abstract

The physical properties of an intermetallic compound CeRh₂Ga₂ have been investigated by magnetic susceptibility [Formula: see text], isothermal magnetization M(H), heat capacity [Formula: see text], electrical resistivity [Formula: see text], thermal conductivity [Formula: see text] and thermopower S(T) measurements. CeRh₂Ga₂ is found to crystallize with CaBe₂Ge₂-type primitive tetragonal structure (space group P4/nmm). No evidence of long range magnetic order is seen down to 1.8 K. The [Formula: see text] data show paramagnetic behavior with an effective moment [Formula: see text]/Ce indicating Ce³⁺ valence state of Ce ions. The [Formula: see text] data exhibit Kondo lattice behavior with a metallic ground state. The low-T [Formula: see text] data yield an enhanced Sommerfeld coefficient [Formula: see text] mJ/mol K² characterizing CeRh₂Ga₂ as a moderate heavy fermion system. The high-T [Formula: see text] and [Formula: see text] show an anomaly near 255 K, reflecting a phase transition. The [Formula: see text] suggests phonon dominated thermal transport with considerably higher values of Lorenz number L(T) compared to the theoretical Sommerfeld value L ₀.