Effect of annealing on the electrical resistivity of Kondo lattice CeRh2Ga2

V. K. Anand, D. T. Adroja, A. Aarti, A. Bhattacharyya, B. Lake

Research output: Contribution to journalArticlepeer-review

Abstract

CeRh2Ga2, which crystallizes in CaBe2Ge2-type primitive tetragonal structure (space group P4/nmm), is known to exhibit Kondo lattice heavy fermion behavior and is proposed to be a potential candidate for Weyl-Kondo semimetal phase. Here we examine the effect of annealing, particularly on the electrical resistivity of polycrystalline CeRh2Ga2. A comparative study of the powder x-ray diffraction (XRD), magnetic susceptibility χ(T), heat capacity C p(T) and electrical resistivity ρ(T) data of both as-arc-melted and annealed CeRh2Ga2 samples are presented. The XRD patterns of both as-arc-melted and annealed samples look similar. No marked effect of annealing could be clearly seen in the temperature dependences of χ and C p data. However, the effect of annealing is clearly manifested in the T dependence of ρ, particlularly at low temperatures. At low-T the ρ(T) data of as-arc-melted CeRh2Ga2 follow a T 2 temperature dependence (Fermi-liquid feature), whereas the ρ(T) data of annealed CeRh2Ga2 exhibit an upturn (semimetal-like feature).

Original languageEnglish
Article number055977
JournalPhysica Scripta
Volume99
Issue number5
DOIs
Publication statusPublished - 1 May 2024

Keywords

  • electrical resistivity
  • fermi-liquid
  • heavy fermion
  • Kondo semimetal

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Mathematical Physics
  • Condensed Matter Physics

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