Half-semimetals, characterized by their spin-polarized electronic states, hold significant promise for spintronic applications but remain scarce due to stringent electronic and magnetic criteria. Through a combination of transport measurements and optical spectroscopy, we investigated the intermetallic compound Mn4Al11, which features an exceptionally low carrier concentration and undergoes a magnetic phase transition near 68 K. Transport measurements reveal anomalies that deviate from typical metallic behavior at low temperatures. Optical spectroscopy indicates a small, nearly frequency-independent optical conductivity in the far-infrared region, with spectral weight decreasing as the temperature drops from 300 K to 50 K. These behaviors suggest a temperaturedependent carrier density and significant scattering of charge carriers. Combining experimental findings with calculated electronic band structures, we propose that Mn4Al11 is a novel half-semimetal candidate exhibiting a ferrimagnetic ground state.
@article{arxiv.2508.11930,
title = {Mn4Al11: A Half-Semimetal Candidate with Anomalous Electronic Behaviors},
author = {Shanshan Han and Rongsheng Li and Xingxing Jiang and Ming Lu and Shuxiang Xu and Jiang Zeng and Dong Wu and Nanlin Wang},
journal= {arXiv preprint arXiv:2508.11930},
year = {2025}
}