Negative Longitudinal Magnetoresistance in the Dirac Semimetal PtSe$_2$ -- Kondo Effect and Surface Spin Dynamics
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arXiv
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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866929450574151680 |
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| author | Salchegger, Julian Max Adhikari, Rajdeep Faina, Bogdan Pesic, Jelena Bonanni, Alberta |
| author_facet | Salchegger, Julian Max Adhikari, Rajdeep Faina, Bogdan Pesic, Jelena Bonanni, Alberta |
| contents | The emergence of negative longitudinal magnetoresistance in the topologically non-trivial 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_16469 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Negative Longitudinal Magnetoresistance in the Dirac Semimetal PtSe$_2$ -- Kondo Effect and Surface Spin Dynamics Salchegger, Julian Max Adhikari, Rajdeep Faina, Bogdan Pesic, Jelena Bonanni, Alberta Materials Science The emergence of negative longitudinal magnetoresistance in the topologically non-trivial 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. |
| title | Negative Longitudinal Magnetoresistance in the Dirac Semimetal PtSe$_2$ -- Kondo Effect and Surface Spin Dynamics |
| topic | Materials Science |
| url | https://arxiv.org/abs/2407.16469 |