Spontaneous Anomalous Hall Effect at Room Temperature in Antiferromagnetic Material NbMnAs

Abstract

Recent studies have shown that certain antiferromagnetic (AFM) materials with the same symmetry breaking as ferromagnets can generate sufficiently large ferromagnetic (FM) responses. Here, we report that the new AFM material NbMnAs exhibits a large anomalous Hall effect (AHE) at zero field and at room temperature, despite having only a small net magnetization. A polycrystalline sample of NbMnAs, likely close to stoichiometric composition, exhibited an AFM state with a small spontaneous magnetization of approximately $6\times 10^{-3}{\mu }_{\mathrm{B}}$/Mn and the AHE below $T_{\mathrm{N}}=354\mathrm{K}$. In contrast, single crystals of NbMnAs obtained by a flux method exhibited a deficiency at the As site, {which resulted} in a decrease in $T_{\mathrm{N}}$ and an increase in spontaneous magnetization. Although improvement of the single-crystal growth is still required, our study reveals that NbMnAs is a novel material capable of exhibiting significant FM responses derived from antiferromagnetism at room temperature.

7 pages, 3 figures

References in corpus (14)

• Anomalous Hall effect
• Large anomalous Hall effect driven by non-vanishing Berry curvature in non-collinear antiferromagnetic Mn3Ge
• Anomalous Hall effect arising from noncollinear antiferromagnetism
• Spontaneous anomalous Hall effect arising from an unconventional compensated magnetic phase in a semiconductor
• Giant Anomalous Hall Effect in the Chiral Antiferromagnet Mn3Ge
• Cluster multipole theory for anomalous Hall effect in antiferromagnets
• Room-Temperature Terahertz Anomalous Hall Effect in Weyl Antiferromagnet Mn${}_3$Sn Thin Films
• Field-tunable toroidal moment and anomalous Hall effect in noncollinear antiferromagnetic Weyl semimetal Co1/3TaS2
• Discovery of ferromagnetism with large magnetic anisotropy in ZrMnP and HfMnP
• Anomalous Hall effect triggered by pressure-induced magnetic phase transition in $\alpha$-Mn
• Large anomalous Hall effect and unusual domain switching in an orthorhombic antiferromagnetic material NbMnP
• Large Anomalous Hall Conductivity Derived from an $f$-Electron Collinear Antiferromagnetic Structure
• Intrinsic anomalous Hall effect arising from antiferromagnetic structure revealed by high-quality NbMnP
• Large spontaneous Hall effect with flexible domain control in an antiferromagnetic material TaMnP