Crystal Electric Field Analysis on the Magnetic Properties of Ferromagnetic CeRu2Ge2 Single Crystal
Abstract
We report a detailed anisotropic studies on the magnetic and transport properties of a CeRu2Ge2 single crystal. A clear ferromagnetic transition is observed at TC = 7.5~K in the magnetic susceptibility, electrical resistivity and heat capacity measurements. The magnetoresistance (MR) is positive at low temperature within the magnetically ordered state. We confirmed the presence of a magnon excitation gap in the resistivity, MR and the low temperature heat capacity data. The pronounced anisotropy observed in the magnetic susceptibility and magnetization along the [100] and [001] directions is quantitatively explained within the crystal electric field (CEF) framework using the point-charge model. The analysis reveals a CEF level scheme comprising three doublets, with a ground state and two excited states at 491 and 671~K, that was further confirmed from the Schottky effect in the magnetic part of the heat capacity data. Unlike most Kondo lattice ferromagnets of Ce compounds, where the magnetic easy axis deviates from the expected CEF ground state, CeRu2Ge2 exhibits magnetization, which is fully consistent with the CEF derived ground state wave function, with the easy axis of magnetization aligned along the [001] direction.
Versions
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BibTeX
@misc{dan2026crystal,
title = {{Crystal Electric Field Analysis on the Magnetic Properties of Ferromagnetic CeRu$_2$Ge$_2$ Single Crystal}},
author = {Shovan Dan and Suman Nandi and Gourav Dwari and Bishal Baran Maity and Bhagyashree A Chalke and Ruta Kulkarni and P. D. Babu and Arumugam Thamizhavel},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.26587},
eprint = {2609.26587},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.26587},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Crystal Electric Field Analysis on the Magnetic Properties of Ferromagnetic CeRu_2Ge_2 Single Crystal
AU - Shovan Dan
AU - Suman Nandi
AU - Gourav Dwari
AU - Bishal Baran Maity
AU - Bhagyashree A Chalke
AU - Ruta Kulkarni
AU - P. D. Babu
AU - Arumugam Thamizhavel
PY - 2026
DA - 2026/09/22
PB - arXiv
DO - 10.48550/arxiv.2609.26587
UR - https://arxiv.org/abs/2609.26587
AB - We report a detailed anisotropic studies on the magnetic and transport properties of a CeRu_2Ge_2 single crystal. A clear ferromagnetic transition is observed at T_C = 7.5~K in the magnetic susceptibility, electrical resistivity and heat capacity measurements. The magnetoresistance (MR) is positive at low temperature within the magnetically ordered state. We confirmed the presence of a magnon excitation gap in the resistivity, MR and the low temperature heat capacity data. The pronounced anisotropy observed in the magnetic susceptibility and magnetization along the [100] and [001] directions is quantitatively explained within the crystal electric field (CEF) framework using the point-charge model. The analysis reveals a CEF level scheme comprising three doublets, with a ground state and two excited states at 491 and 671~K, that was further confirmed from the Schottky effect in the magnetic part of the heat capacity data. Unlike most Kondo lattice ferromagnets of Ce compounds, where the magnetic easy axis deviates from the expected CEF ground state, CeRu_2Ge_2 exhibits magnetization, which is fully consistent with the CEF derived ground state wave function, with the easy axis of magnetization aligned along the [001] direction.
ER -