Magnetic phases of Kondo lattice materials Ce5RhGe2 and Ce5IrGe2
Abstract
Single crystals of Ce5RhGe2 and Ce5IrGe2 have been systematically investigated by electrical resistivity, specific heat, and magnetization measurements. Together with Ce5CoGe2, all three compounds crystallize in the orthorhombic \emph{Pnma} structure, with the lattice parameters increasing monotonically from Co to Rh to Ir, consistent with the effect of negative chemical pressure. Magnetization measurements along the three principal crystallographic axes identify the \emph{a} axis as the easy magnetization direction throughout the series. Ce5RhGe2 exhibits ferromagnetic ordering with a Curie temperature of approximately 11.5 K and shows magnetic behavior closely resembling that of Ce5CoGe2. In contrast, Ce5IrGe2 undergoes two successive magnetic transitions at TM1=12.7 K and TM2=11.8 K, and there are multiple metamagnetic transitions under magnetic fields, giving rise to magnetization plateaus at fractions of the saturation magnetization Ms of approximately Ms/5 and Ms/3. The low-field metamagnetic transition along the easy axis shifts to lower field with decreasing temperature, and eventually a pronounced hysteresis loop is observed about zero-field, establishing that Ce5IrGe2 exhibits a ferrimagnetic ground state at the lowest measured temperatures.
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BibTeX
@misc{zhang2026magnetic,
title = {{Magnetic phases of Kondo lattice materials Ce$_5$RhGe$_2$ and Ce$_5$IrGe$_2$}},
author = {Jiawen Zhang and Yanan Zhang and Mingyi Wang and Ye Chen and Yu Liu and Yongjun Zhang and Michael Smidman and Huiqiu Yuan},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.08580},
eprint = {2609.08580},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.08580},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Magnetic phases of Kondo lattice materials Ce_5RhGe_2 and Ce_5IrGe_2
AU - Jiawen Zhang
AU - Yanan Zhang
AU - Mingyi Wang
AU - Ye Chen
AU - Yu Liu
AU - Yongjun Zhang
AU - Michael Smidman
AU - Huiqiu Yuan
PY - 2026
DA - 2026/09/08
PB - arXiv
DO - 10.48550/arxiv.2609.08580
UR - https://arxiv.org/abs/2609.08580
AB - Single crystals of Ce_5RhGe_2 and Ce_5IrGe_2 have been systematically investigated by electrical resistivity, specific heat, and magnetization measurements. Together with Ce_5CoGe_2, all three compounds crystallize in the orthorhombic \emph{Pnma} structure, with the lattice parameters increasing monotonically from Co to Rh to Ir, consistent with the effect of negative chemical pressure. Magnetization measurements along the three principal crystallographic axes identify the \emph{a} axis as the easy magnetization direction throughout the series. Ce_5RhGe_2 exhibits ferromagnetic ordering with a Curie temperature of approximately 11.5 K and shows magnetic behavior closely resembling that of Ce_5CoGe_2. In contrast, Ce_5IrGe_2 undergoes two successive magnetic transitions at T_M1=12.7 K and T_M2=11.8 K, and there are multiple metamagnetic transitions under magnetic fields, giving rise to magnetization plateaus at fractions of the saturation magnetization M_s of approximately M_s/5 and M_s/3. The low-field metamagnetic transition along the easy axis shifts to lower field with decreasing temperature, and eventually a pronounced hysteresis loop is observed about zero-field, establishing that Ce_5IrGe_2 exhibits a ferrimagnetic ground state at the lowest measured temperatures.
ER -