Negative longitudinal magnetoresistance in the Dirac semimetalPtSe2: Kondo effect and surface spin dynamics

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

Physical Review B Pub Date : 2024-11-01 DOI:10.1103/physrevb.110.205403

Julian Max Salchegger, Rajdeep Adhikari, Bogdan Faina, Jelena Pešić, Alberta Bonanni

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引用次数: 0

Abstract

The emergence of negative longitudinal magnetoresistance in the topologically nontrivial transition-metal dichalcogenide

PtSe 2

is studied. Low-

𝑇

, high-

𝜇 0 𝐻

transport is performed for arbitrary field directions, and an analytical framework is established. The source of the negative longitudinal magnetoresistance is identified as the Kondo effect stemming from Pt vacancies contributing an uncompensated spin exclusively at the sample surface. The concentration of vacancies and the sample thickness are identified as tuning parameters. The findings are substantiated by density functional theory, which corroborates the proposed Pt-vacancy model.

查看原文本刊更多论文

狄拉克半金属铂硒2中的负纵向磁阻：近藤效应和表面自旋动力学

研究了拓扑学上非三价过渡金属二卤化物 PtSe2 中出现的负纵向磁阻。对任意场方向进行了低𝑇、高𝜇0𝐻 传输，并建立了分析框架。负纵向磁阻的来源被确定为 Kondo 效应，源于铂空位在样品表面产生的未补偿自旋。空位浓度和样品厚度被确定为调谐参数。密度泛函理论证实了这些发现，并证实了所提出的铂空位模型。

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