Probing the valence transition in Ce2Rh2Ga by chemical pressure

S. P. Xhakaza; A. M. Strydom

doi:10.1016/j.jmmm.2025.173680

Probing the valence transition in Ce2Rh2Ga by chemical pressure

S. P. Xhakaza, A. M. Strydom

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

We have investigated the behaviour of site-selective substitution in the intermetallic compound Ce₂Rh₂Ga which has coinciding crystal structure and valence transitions at T_t=128.5 K, by means of magnetic susceptibility and specific heat. Substitutions were performed on each of the Ce, Rh, and Ga sites to a level of 10at.%. All the substituted samples proved to crystallize at room temperature in the expected orthorhombic La₂Ni₃-type (Cmce, nr. 64), demonstrating the structural robustness of the host lattice upon doping. In only two of the compounds, namely Ce_1.8La_0.2Rh₂Ga and Ce₂Rh₂Ga_0.9Al_0.1 was the transition at T_t found to disappear.

Original language	English
Article number	173680
Journal	Journal of Magnetism and Magnetic Materials
Volume	637
DOIs	https://doi.org/10.1016/j.jmmm.2025.173680
Publication status	Published - 1 Jan 2026

Keywords

CeRhGa
Crystal structure change
Magnetic susceptibility
Specific heat
Strongly correlated electrons
Valence change

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1016/j.jmmm.2025.173680

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title = "Probing the valence transition in Ce2Rh2Ga by chemical pressure",

abstract = "We have investigated the behaviour of site-selective substitution in the intermetallic compound Ce2Rh2Ga which has coinciding crystal structure and valence transitions at Tt=128.5 K, by means of magnetic susceptibility and specific heat. Substitutions were performed on each of the Ce, Rh, and Ga sites to a level of 10at.\%. All the substituted samples proved to crystallize at room temperature in the expected orthorhombic La2Ni3-type (Cmce, nr. 64), demonstrating the structural robustness of the host lattice upon doping. In only two of the compounds, namely Ce1.8La0.2Rh2Ga and Ce2Rh2Ga0.9Al0.1 was the transition at Tt found to disappear.",

keywords = "CeRhGa, Crystal structure change, Magnetic susceptibility, Specific heat, Strongly correlated electrons, Valence change",

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doi = "10.1016/j.jmmm.2025.173680",

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T1 - Probing the valence transition in Ce2Rh2Ga by chemical pressure

AU - Xhakaza, S. P.

AU - Strydom, A. M.

PY - 2026/1/1

Y1 - 2026/1/1

N2 - We have investigated the behaviour of site-selective substitution in the intermetallic compound Ce2Rh2Ga which has coinciding crystal structure and valence transitions at Tt=128.5 K, by means of magnetic susceptibility and specific heat. Substitutions were performed on each of the Ce, Rh, and Ga sites to a level of 10at.%. All the substituted samples proved to crystallize at room temperature in the expected orthorhombic La2Ni3-type (Cmce, nr. 64), demonstrating the structural robustness of the host lattice upon doping. In only two of the compounds, namely Ce1.8La0.2Rh2Ga and Ce2Rh2Ga0.9Al0.1 was the transition at Tt found to disappear.

AB - We have investigated the behaviour of site-selective substitution in the intermetallic compound Ce2Rh2Ga which has coinciding crystal structure and valence transitions at Tt=128.5 K, by means of magnetic susceptibility and specific heat. Substitutions were performed on each of the Ce, Rh, and Ga sites to a level of 10at.%. All the substituted samples proved to crystallize at room temperature in the expected orthorhombic La2Ni3-type (Cmce, nr. 64), demonstrating the structural robustness of the host lattice upon doping. In only two of the compounds, namely Ce1.8La0.2Rh2Ga and Ce2Rh2Ga0.9Al0.1 was the transition at Tt found to disappear.

KW - CeRhGa

KW - Crystal structure change

KW - Magnetic susceptibility

KW - Specific heat

KW - Strongly correlated electrons

KW - Valence change

UR - https://www.scopus.com/pages/publications/105022262472

U2 - 10.1016/j.jmmm.2025.173680

DO - 10.1016/j.jmmm.2025.173680

M3 - Article

AN - SCOPUS:105022262472

SN - 0304-8853

VL - 637

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

M1 - 173680

ER -

Probing the valence transition in Ce2Rh2Ga by chemical pressure

Abstract

Keywords

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