Probing Short-Range Correlations in the van der Waals Magnet CrSBr by Small-Angle Neutron Scattering
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arXiv
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2024
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| author | Rybakov, Andrey Boix-Constant, Carla Venero, Diego Alba van der Zant, Herre S. J. Mañas-Valero, Samuel Coronado, Eugenio |
| author_facet | Rybakov, Andrey Boix-Constant, Carla Venero, Diego Alba van der Zant, Herre S. J. Mañas-Valero, Samuel Coronado, Eugenio |
| contents | The layered metamagnet CrSBr offers a rich interplay between magnetic, optical and electrical properties that can be extended down to the two-dimensional (2D) limit. Despite the extensive research regarding the long-range magnetic order in magnetic van der Waals materials, short-range correlations have been loosely investigated. By using Small-Angle Neutron Scattering (SANS) we show the formation of short-range magnetic regions in CrSBr with correlation lengths that increase upon cooling up to ca. 3 nm at the antiferromagnetic ordering temperature (TN ~ 140 K). Interestingly, these ferromagnetic correlations start developing below 200 K, i.e., well above TN. Below TN, these correlations rapidly decrease and are negligible at low-temperatures. The experimental results are well-reproduced by an effective spin Hamiltonian, which pinpoints that the short-range correlations in CrSBr are intrinsic to the monolayer limit, and discard the appearance of any frustrated phase in CrSBr at low-temperatures within our experimental window between 2 and 200 nm. Overall, our results are compatible with a spin freezing scenario of the magnetic fluctuations in CrSBr and highlight SANS as a powerful technique for characterizing the rich physical phenomenology beyond the long-range order paradigm offered by van der Waals magnets. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2405_18967 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Probing Short-Range Correlations in the van der Waals Magnet CrSBr by Small-Angle Neutron Scattering Rybakov, Andrey Boix-Constant, Carla Venero, Diego Alba van der Zant, Herre S. J. Mañas-Valero, Samuel Coronado, Eugenio Strongly Correlated Electrons The layered metamagnet CrSBr offers a rich interplay between magnetic, optical and electrical properties that can be extended down to the two-dimensional (2D) limit. Despite the extensive research regarding the long-range magnetic order in magnetic van der Waals materials, short-range correlations have been loosely investigated. By using Small-Angle Neutron Scattering (SANS) we show the formation of short-range magnetic regions in CrSBr with correlation lengths that increase upon cooling up to ca. 3 nm at the antiferromagnetic ordering temperature (TN ~ 140 K). Interestingly, these ferromagnetic correlations start developing below 200 K, i.e., well above TN. Below TN, these correlations rapidly decrease and are negligible at low-temperatures. The experimental results are well-reproduced by an effective spin Hamiltonian, which pinpoints that the short-range correlations in CrSBr are intrinsic to the monolayer limit, and discard the appearance of any frustrated phase in CrSBr at low-temperatures within our experimental window between 2 and 200 nm. Overall, our results are compatible with a spin freezing scenario of the magnetic fluctuations in CrSBr and highlight SANS as a powerful technique for characterizing the rich physical phenomenology beyond the long-range order paradigm offered by van der Waals magnets. |
| title | Probing Short-Range Correlations in the van der Waals Magnet CrSBr by Small-Angle Neutron Scattering |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2405.18967 |