Giant exchange splitting in the electronic structure of A-type 2D antiferromagnet CrSBr
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arXiv
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| Autori principali: | , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866916351931580416 |
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| author | Watson, Matthew D. Acharya, Swagata Nunn, James E. Nagireddy, Laxman Pashov, Dimitar Rösner, Malte van Schilfgaarde, Mark Wilson, Neil R. Cacho, Cephise |
| author_facet | Watson, Matthew D. Acharya, Swagata Nunn, James E. Nagireddy, Laxman Pashov, Dimitar Rösner, Malte van Schilfgaarde, Mark Wilson, Neil R. Cacho, Cephise |
| contents | We present the evolution of the electronic structure of CrSBr from its antiferromagnetic ground state to the paramagnetic phase above T_N=132 K, in both experiment and theory. Low temperature angle-resolved photoemission spectroscopy (ARPES) results are obtained using a novel method to overcome sample charging issues, revealing quasi-2D valence bands in the ground state. The results are very well reproduced by our QSGŴ calculations, which further identify certain bands at the X points to be exchange-split pairs of states with mainly Br and S character. By tracing band positions as a function of temperature, we show the splitting disappears above T_N. The energy splitting is interpreted as an effective exchange splitting in individual layers in which the Cr moments all align, within the so-called A-type antiferromagnetic arrangement. Our results lay firm foundations for the interpretation of the many other intriguing physical and optical properties of CrSBr. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_10867 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Giant exchange splitting in the electronic structure of A-type 2D antiferromagnet CrSBr Watson, Matthew D. Acharya, Swagata Nunn, James E. Nagireddy, Laxman Pashov, Dimitar Rösner, Malte van Schilfgaarde, Mark Wilson, Neil R. Cacho, Cephise Strongly Correlated Electrons We present the evolution of the electronic structure of CrSBr from its antiferromagnetic ground state to the paramagnetic phase above T_N=132 K, in both experiment and theory. Low temperature angle-resolved photoemission spectroscopy (ARPES) results are obtained using a novel method to overcome sample charging issues, revealing quasi-2D valence bands in the ground state. The results are very well reproduced by our QSGŴ calculations, which further identify certain bands at the X points to be exchange-split pairs of states with mainly Br and S character. By tracing band positions as a function of temperature, we show the splitting disappears above T_N. The energy splitting is interpreted as an effective exchange splitting in individual layers in which the Cr moments all align, within the so-called A-type antiferromagnetic arrangement. Our results lay firm foundations for the interpretation of the many other intriguing physical and optical properties of CrSBr. |
| title | Giant exchange splitting in the electronic structure of A-type 2D antiferromagnet CrSBr |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2403.10867 |