Origin of the anomalous Hall effect in Cr-doped RuO2

IF 3.7 2区物理与天体物理 Q1 Physics and Astronomy

Physical Review B Pub Date : 2025-02-03 DOI:10.1103/physrevb.111.064406

Andriy Smolyanyuk, Libor Šmejkal, Igor I. Mazin

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引用次数: 0

Abstract

RuO2 is one of the most highlighted candidates for altermagnetism. However, the most recent muon spin spectroscopy and neutron studies demonstrated the absence of magnetic order in this system. The electronic structure of RuO2 hints at a possibility of realizing a magnetically ordered state upon hole doping, and such a possibility was explored experimentally in Cr-doped RuO2, where it was suggested that this system exhibits the anomalous Hall effect (AHE) due to altermagnetism. In this paper, based on our density functional calculations, we revise the results obtained for this system and propose a different interpretation of experimental results. Our calculations suggest that extra holes are bound to Cr impurity and do not dope Ru bands, which remain nonmagnetic. Thus, the observed AHE is not due to the altermagnetism but stems entirely from magnetic Cr ions.

Published by the American Physical Society

2025

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掺铬RuO2中异常霍尔效应的起源

RuO2是最突出的候选电磁材料之一。然而，最近的μ子自旋光谱和中子研究表明，该系统中缺乏磁序。RuO2的电子结构暗示了空穴掺杂后实现磁有序态的可能性，在cr掺杂的RuO2中实验探索了这种可能性，表明该体系由于变磁而表现出反常霍尔效应（AHE）。本文在密度泛函计算的基础上，对该系统的结果进行了修正，并对实验结果提出了不同的解释。我们的计算表明，额外的空穴与Cr杂质结合，而不掺杂Ru带，Ru带仍然是非磁性的。因此，观察到的AHE不是由变磁引起的，而是完全由磁性铬离子引起的。2025年由美国物理学会出版

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physical Review B 物理-物理：凝聚态物理

CiteScore

6.70

自引率

32.40%

发文量

审稿时长

3.0 months

期刊介绍： Physical Review B (PRB) is the world’s largest dedicated physics journal, publishing approximately 100 new, high-quality papers each week. The most highly cited journal in condensed matter physics, PRB provides outstanding depth and breadth of coverage, combined with unrivaled context and background for ongoing research by scientists worldwide. PRB covers the full range of condensed matter, materials physics, and related subfields, including: -Structure and phase transitions -Ferroelectrics and multiferroics -Disordered systems and alloys -Magnetism -Superconductivity -Electronic structure, photonics, and metamaterials -Semiconductors and mesoscopic systems -Surfaces, nanoscience, and two-dimensional materials -Topological states of matter