Complex magnetic phase diagrams in Tb2IrAl4Ge2 and Er2IrAl4Ge2
Abstract
We report the synthesis and comprehensive investigation of single-crystalline Tb2IrAl4Ge2 and Er2IrAl4Ge2, the first Ir-based members of the Ln2MAl4Ge2 family. Both compounds crystallize in the tetragonal Tb2NiAl4Ge2-type structure (space group I4/mmm) and exhibit easy-axis magnetic anisotropy with the crystallographic c axis as the preferred magnetization direction. Tb2IrAl4Ge2 undergoes antiferromagnetic ordering below TN = 25 K and develops a sequence of field-induced metamagnetic transitions accompanied by pronounced magnetotransport anomalies, including a nonlinear Hall response. In contrast, Er2IrAl4Ge2 exhibits three successive zero-field magnetic transitions and a substantially richer low-temperature magnetic phase diagram comprising multiple competing field-induced phases confined to relatively modest magnetic fields. The differences between the Tb- and Er-based compounds demonstrate the wide range of magnetic behavior that can be realized within the \ce{Tb2NiAl4Ge2}-type structure. More broadly, the successful realization of Ir-based Ln2MAl4Ge2 compounds considerably expands the accessible chemical space of this family and opens a route toward the exploration of related 4d- and 5d-based aluminogermanides.
Versions
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BibTeX
@misc{gornicka2026complex,
title = {{Complex magnetic phase diagrams in Tb$_2$IrAl$_4$Ge$_2$ and Er$_2$IrAl$_4$Ge$_2$}},
author = {Karolina Gornicka and Matthew S. Cook and Brenden R. Ortiz and Andrew D. Christianson and Andrew F. May},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.01714},
eprint = {2610.01714},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.01714},
}
RIS
TY - UNPB
TI - Complex magnetic phase diagrams in Tb_2IrAl_4Ge_2 and Er_2IrAl_4Ge_2
AU - Karolina Gornicka
AU - Matthew S. Cook
AU - Brenden R. Ortiz
AU - Andrew D. Christianson
AU - Andrew F. May
PY - 2026
DA - 2026/10/01
PB - arXiv
DO - 10.48550/arxiv.2610.01714
UR - https://arxiv.org/abs/2610.01714
AB - We report the synthesis and comprehensive investigation of single-crystalline Tb_2IrAl_4Ge_2 and Er_2IrAl_4Ge_2, the first Ir-based members of the Ln_2MAl_4Ge_2 family. Both compounds crystallize in the tetragonal Tb_2NiAl_4Ge_2-type structure (space group I4/mmm) and exhibit easy-axis magnetic anisotropy with the crystallographic c axis as the preferred magnetization direction. Tb_2IrAl_4Ge_2 undergoes antiferromagnetic ordering below T_N = 25 K and develops a sequence of field-induced metamagnetic transitions accompanied by pronounced magnetotransport anomalies, including a nonlinear Hall response. In contrast, Er_2IrAl_4Ge_2 exhibits three successive zero-field magnetic transitions and a substantially richer low-temperature magnetic phase diagram comprising multiple competing field-induced phases confined to relatively modest magnetic fields. The differences between the Tb- and Er-based compounds demonstrate the wide range of magnetic behavior that can be realized within the \ce{Tb2NiAl4Ge2}-type structure. More broadly, the successful realization of Ir-based Ln_2MAl_4Ge_2 compounds considerably expands the accessible chemical space of this family and opens a route toward the exploration of related 4d- and 5d-based aluminogermanides.
ER -