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MA: Fachverband Magnetismus

MA 33: Altermagnets IV

MA 33.4: Vortrag

Mittwoch, 11. März 2026, 15:45–16:00, HSZ/0002

Optical investigations of electron-doped FeSb₂ — Renjith Mathew Roy¹, •Maxim Wenzel¹, Maksim Povolotskiy¹, Christian Prange¹, Artem Pronin¹, Yujie Xie², Tiantian Zhang², Vignesh Sundaramurthy³, Maximilian van de Loo⁴, Jule Kirschke⁴, Andreas Kreyssig⁴, Anna Böhmer⁴, and Martin Dressel¹ — ¹1. Physikalisches Institut, Universität Stuttgart — ²Institute of Theoretical Physics, Chinese Academy of Science, 100190 Beijing, China — ³Max-Planck-Institute for Solid State Research, 70569 Stuttgart — ⁴Experimental Physics IV, Ruhr Universität Bochum

While the marcasite-structured semiconductor FeSb₂ is nonmagnetic, theoretical predictions suggest that hole or electron doping can stabilize an altermagnetic order with a substantial non-relativistic spin splitting of approximately 0.2 eV [1].

Here, we investigate a series of Co-doped FeSb₂ samples using optical spectroscopic techniques including broadband infrared spectroscopy, Müller-matrix ellipsometry, and Raman scattering. Combined with density-functional theory calculations, we discuss the effects of electron doping and the consequent magnetic ordering on the electronic structure and optical phonon modes. In particular, we address the possibility of an emerging altermagnetic state for dopings above x = 0.12.

[1] I. I. Mazin, K. Koepernik, M. D. Johannes, R. González-Hernández, L. Smejkal, PNAS 118, e2108924118 (2021)

Keywords: Optical Spectroscopy; Ellipsometry; Electronic Structure; Density-functional-theory