Kondo lattice heavy fermion behavior in CeRh 2 Ga 2

• Published in: Journal of physics. Condensed matter Vol. 29; no. 13; p. 135601
• Main Authors: Anand, V K, Adroja, D T, Bhattacharyya, A, Klemke, B, Lake, B
• Format: Journal Article
• Language: English
• Published: England 05.04.2017
• ISSN: 0953-8984; 1361-648X
• DOI: 10.1088/1361-648X/aa5b5d

The physical properties of an intermetallic compound CeRh Ga 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. CeRh Ga is found to crystallize with CaBe Ge -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 Ce 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 K characterizing CeRh Ga 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 .