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Simultaneous colossal magnetoresistance and angular magnetoresistance in the antiferromagnetic semiconductor EuSe2

Qingxin Dong1,2,*, Pengtao Yang1,2,*, Zhihao Liu1,2,*, Yuzhi Wang1,2, Hui Wen3,4, Ziyi Liu1,2, Tong Shi1,5, Zhaoming Tian5, Jianping Sun1,2 et al.

Yoshiya Uwatoko6, Quansheng Wu1,2,†, Genfu Chen1,2,7,‡, Bosen Wang1,2,§, and Jinguang Cheng1,2,∥

  • *These authors contributed equally to this work.
  • †Contact author: quansheng.wu@iphy.ac.cn
  • ‡Contact author: gfchen@iphy.ac.cn
  • §Contact author: bswang@iphy.ac.cn
  • ∥Contact author: jgcheng@iphy.ac.cn

Phys. Rev. B 112, L140405 – Published 22 October, 2025

DOI: https://doi.org/10.1103/p2c5-r163

Abstract

We report on the discovery of field-induced large colossal magnetoresistance (CMR) of ∼ −1014% and angular magnetoresistance (AMR) ∼ 1014% achieved simultaneously in an antiferromagnetic rare-earth dichalcogenide EuSe2. Such intriguing observations are attributed to strong magnetic anisotropy and magnetic-field induced antiferromagnetic to ferromagnetic transition of the localized Eu2+ spins, which in turn closes the bandgap by lifting the degeneracy of Se-5p bands near Fermi level. Our density functional theory calculations perfectly replicate the experimental findings based on the Brillouin function and carries transport model. The present work provides a potential simple antiferromagnetic material for achieving angle-sensitive spintronic devices.

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