Kondo lattice heavy fermion behavior in CeRh2Ga2. (14th February 2017)

• Record Type: Journal Article
• Authors: Anand, V K; Adroja, D T; Bhattacharyya, A; Klemke, B; Lake, B
• Is Part Of: Journal of physics. Volume 29:Number 13(2017)
• Publication Date: 2017-02-14
• Subjects: Kondo lattice -- heavy fermion -- heat capacity -- thermopower -- thermal conductivity; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/aa5b5d
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: The physical properties of an intermetallic compound CeRh2 Ga2 have been investigated by magnetic susceptibility χ ( T ), isothermal magnetization M ( H ), heat capacity C p ( T ), electrical resistivity ρ ( T ), thermal conductivity κ ( T ) and thermopower S ( T ) measurements. CeRh2 Ga2 is found to crystallize with CaBe2 Ge2 -type primitive tetragonal structure (space group P 4/ nmm ). No evidence of long range magnetic order is seen down to 1.8 K. The χ ( T ) data show paramagnetic behavior with an effective moment μ e f f ≈ 2.5 μ B /Ce indicating Ce 3+ valence state of Ce ions. The ρ ( T ) data exhibit Kondo lattice behavior with a metallic ground state. The low- T C p ( T ) data yield an enhanced Sommerfeld coefficient γ = 130 ( 2 ) mJ/mol K 2 characterizing CeRh2 Ga2 as a moderate heavy fermion system. The high- T C p ( T ) and ρ ( T ) show an anomaly near 255 K, reflecting a phase transition. The κ ( T ) suggests phonon dominated thermal transport with considerably higher values of Lorenz number L ( T ) compared to the theoretical Sommerfeld value L 0 .