Positive Oscillating Magnetoresistance in a van der Waals Antiferromagnetic Semiconductor
In all van der Waals layered antiferromagnetic semiconductors investigated so far, a negative magnetoresistance has been observed in vertical transport measurements, with characteristic trends that do not depend on applied bias. Here, we report vertical transport measurements on a layered antiferrom...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2025-01-01
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| Series: | Physical Review X |
| Online Access: | http://doi.org/10.1103/PhysRevX.15.011017 |
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| author | Xiaohanwen Lin Fan Wu Nicolas Ubrig Menghan Liao Fengrui Yao Ignacio Gutiérrez-Lezama Alberto F. Morpurgo |
| author_facet | Xiaohanwen Lin Fan Wu Nicolas Ubrig Menghan Liao Fengrui Yao Ignacio Gutiérrez-Lezama Alberto F. Morpurgo |
| author_sort | Xiaohanwen Lin |
| collection | DOAJ |
| description | In all van der Waals layered antiferromagnetic semiconductors investigated so far, a negative magnetoresistance has been observed in vertical transport measurements, with characteristic trends that do not depend on applied bias. Here, we report vertical transport measurements on a layered antiferromagnetic semiconductor CrPS_{4} that exhibit a drastically different behavior, namely, a strongly bias-dependent, positive magnetoresistance that is accompanied by pronounced oscillations for devices whose thickness is smaller than 10 nm. We establish that this unexpected behavior originates from transport being space-charge limited and not injection limited as for the layered antiferromagnetic semiconductors studied earlier. Our analysis indicates that the positive magnetoresistance and the oscillations only occur when electrons are injected into in-gap defect states, whereas when electrons are injected into the conduction band, the magnetoresistance vanishes. We propose a microscopic explanation for the observed phenomena that combines concepts typical of transport through disordered semiconductors with known properties of the CrPS_{4} magnetic state, thus capturing all basic experimental observations. Our results illustrate the need to understand, in detail, the nature of transport through vdW magnets in order to extract information about the nature of the order magnetic states and its microscopic properties. |
| format | Article |
| id | doaj-art-791192e794ee42d3966fbf9bb50020f8 |
| institution | Kabale University |
| issn | 2160-3308 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review X |
| spelling | doaj-art-791192e794ee42d3966fbf9bb50020f82025-01-30T15:02:27ZengAmerican Physical SocietyPhysical Review X2160-33082025-01-0115101101710.1103/PhysRevX.15.011017Positive Oscillating Magnetoresistance in a van der Waals Antiferromagnetic SemiconductorXiaohanwen LinFan WuNicolas UbrigMenghan LiaoFengrui YaoIgnacio Gutiérrez-LezamaAlberto F. MorpurgoIn all van der Waals layered antiferromagnetic semiconductors investigated so far, a negative magnetoresistance has been observed in vertical transport measurements, with characteristic trends that do not depend on applied bias. Here, we report vertical transport measurements on a layered antiferromagnetic semiconductor CrPS_{4} that exhibit a drastically different behavior, namely, a strongly bias-dependent, positive magnetoresistance that is accompanied by pronounced oscillations for devices whose thickness is smaller than 10 nm. We establish that this unexpected behavior originates from transport being space-charge limited and not injection limited as for the layered antiferromagnetic semiconductors studied earlier. Our analysis indicates that the positive magnetoresistance and the oscillations only occur when electrons are injected into in-gap defect states, whereas when electrons are injected into the conduction band, the magnetoresistance vanishes. We propose a microscopic explanation for the observed phenomena that combines concepts typical of transport through disordered semiconductors with known properties of the CrPS_{4} magnetic state, thus capturing all basic experimental observations. Our results illustrate the need to understand, in detail, the nature of transport through vdW magnets in order to extract information about the nature of the order magnetic states and its microscopic properties.http://doi.org/10.1103/PhysRevX.15.011017 |
| spellingShingle | Xiaohanwen Lin Fan Wu Nicolas Ubrig Menghan Liao Fengrui Yao Ignacio Gutiérrez-Lezama Alberto F. Morpurgo Positive Oscillating Magnetoresistance in a van der Waals Antiferromagnetic Semiconductor Physical Review X |
| title | Positive Oscillating Magnetoresistance in a van der Waals Antiferromagnetic Semiconductor |
| title_full | Positive Oscillating Magnetoresistance in a van der Waals Antiferromagnetic Semiconductor |
| title_fullStr | Positive Oscillating Magnetoresistance in a van der Waals Antiferromagnetic Semiconductor |
| title_full_unstemmed | Positive Oscillating Magnetoresistance in a van der Waals Antiferromagnetic Semiconductor |
| title_short | Positive Oscillating Magnetoresistance in a van der Waals Antiferromagnetic Semiconductor |
| title_sort | positive oscillating magnetoresistance in a van der waals antiferromagnetic semiconductor |
| url | http://doi.org/10.1103/PhysRevX.15.011017 |
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