The centrosymmetric cubic compound EuTi2Al20, in which magnetic Eu ions form a diamond network, undergoes an antiferromagnetic transition at TN = 3.3 K and exhibits metamagnetic transitions at Hm1 = 1.7 T and Hm2 = 2.8 T for H || [100] at 1.9 K. Between these fields, the magnetization shows a step-like behavior, defining an intermediate field-induced phase (Phase~II). We investigated the electronic transport in Phase~II and found that both the resistivity and Hall resistivity are markedly enhanced, while remaining nearly field independent within the phase. Phase~II appears for all field directions, although its transport response shows moderate directional dependence. These features differ from the strongly orientation-selective behavior often observed in skyrmion-lattice phases of several 4f-electron compounds, suggesting that Phase II may host a field-induced spin texture with a topological character distinct from that of a conventional skyrmion lattice.
@article{arxiv.2601.01788,
title = {Emergent Anomalous Hall Effect in the Eu-Based Compound with a Diamond Network: The Centrosymmetric Cubic Antiferromagnet EuTi$_2$Al$_{20}$},
author = {Ryuji Higashinaka and Kohsuke Sato and Ryosei Ideura and Masahiro Kawamata and Tatsuma D. Matsuda},
journal= {arXiv preprint arXiv:2601.01788},
year = {2026}
}