Andrey Rybakov

2024

1. 

   Probing Short-Range Correlations in the van der Waals Magnet CrSBr by Small-Angle Neutron Scattering

   Andrey Rybakov, Carla Boix-Constant, Diego Alba Venero, Herre S. J. Zant, Samuel Mañas-Valero, and Eugenio Coronado

   Small Science, 2024

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   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) the formation of short-range magnetic regions in CrSBr with correlation lengths that increase upon cooling up to ≈3 nm at the antiferromagnetic ordering temperature (T_N ≈ 140 K) is shown. Interestingly, these ferromagnetic correlations start developing below 200 K, i.e., well above T N. Below T N, 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 the experimental window between 2 and 200 nm. Overall, the obtained 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.

   @article{rybakov2024probing,
     title = {Probing Short-Range Correlations in the van der Waals Magnet CrSBr by Small-Angle Neutron Scattering},
     author = {Rybakov, Andrey and Boix-Constant, Carla and Alba Venero, Diego and van der Zant, Herre S. J. and Mañas-Valero, Samuel and Coronado, Eugenio},
     journal = {Small Science},
     volume = {},
     number = {},
     pages = {},
     year = {2024},
     publisher = {Wiley},
     doi = {doi.org/10.1002/smsc.202400244},
     url = {https://onlinelibrary.wiley.com/doi/full/10.1002/smsc.202400244},
   }