Negative longitudinal magnetoresistance in the Dirac semimetal PtSe 2 : Kondo effect and surface spin dynamics

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...

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Bibliographic Details
Published in:Physical review. B 2024-11, Vol.110 (20), Article 205403
Main Authors: Salchegger, Julian Max, Adhikari, Rajdeep, Faina, Bogdan, Pešić, Jelena, Bonanni, Alberta
Format: Article
Language:English
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Summary: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.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.110.205403