Zhang Yu, Ni Yifei, Schlottmann Pedro, Nandkishore Rahul, DeLong Lance E, Cao Gang
Department of Physics, University of Colorado at Boulder, Boulder, CO, 80309, USA.
Department of Physics, Florida State University, Tallahassee, FL, 32306, USA.
Nat Commun. 2024 Apr 27;15(1):3579. doi: 10.1038/s41467-024-47823-2.
Chiral orbital currents (COC) underpin a novel colossal magnetoresistance in ferrimagnetic MnSiTe. Here we report the Hall effect in the COC state which exhibits the following unprecedented features: (1) A sharp, current-sensitive peak in the magnetic field dependence of the Hall resistivity, and (2) A current-sensitive scaling relation between the Hall conductivity σ and the longitudinal conductivity σ, namely, σ ∝ σ with α reaching up to 5, which is exceptionally large compared to α ≤ 2 typical of all solids. The novel Hall responses along with a current-sensitive carrier density and a large Hall angle of 15% point to a giant, current-sensitive Hall effect that is unique to the COC state. Here, we show that a magnetic field induced by the fully developed COC combines with the applied magnetic field to exert the greatly enhanced transverse force on charge carriers, which dictates the COC Hall responses.
手性轨道电流（COC）是亚铁磁性MnSiTe中一种新型巨磁阻效应的基础。在此，我们报道了COC态下的霍尔效应，其呈现出以下前所未有的特征：（1）霍尔电阻率的磁场依赖性中出现一个尖锐的、对电流敏感的峰值；（2）霍尔电导率σ与纵向电导率σ之间存在对电流敏感的标度关系，即σ ∝ σ ，其中α高达5，与所有固体典型的α≤2相比异常大。这种新颖的霍尔响应以及对电流敏感的载流子密度和15%的大霍尔角表明，存在一种COC态特有的巨大的、对电流敏感的霍尔效应。在此，我们表明，完全发展的COC所感应的磁场与外加磁场相结合，对载流子施加极大增强的横向力，这决定了COC霍尔响应。
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