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Dynamic magnetic crossover at the origin of the hidden-order in van der Waals antiferromagnet CrSBr

Published inNature communications, vol. 13, no. 1, 4745
Publication date2022-08-12
First online date2022-08-12
Abstract

The van-der-Waals material CrSBr stands out as a promising two-dimensional magnet. Here, we report on its detailed magnetic and structural characteristics. We evidence that it undergoes a transition to an A-type antiferromagnetic state below T N ≈ 140 K with a pronounced two-dimensional character, preceded by ferromagnetic correlations within the monolayers. Furthermore, we unravel the low-temperature hidden-order within the long-range magnetically-ordered state. We find that it is associated to a slowing down of the magnetic fluctuations, accompanied by a continuous reorientation of the internal field. These take place upon cooling below T s ≈ 100 K, until a spin freezing process occurs at T * ≈ 40 K. We argue this complex behavior to reflect a crossover driven by the in-plane uniaxial anisotropy, which is ultimately caused by its mixed-anion character. Our findings reinforce CrSBr as an important candidate for devices in the emergent field of two-dimensional magnetic materials.

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Citation (ISO format)
LOPEZ PAZ, Sara Almudena et al. Dynamic magnetic crossover at the origin of the hidden-order in van der Waals antiferromagnet CrSBr. In: Nature communications, 2022, vol. 13, n° 1, p. 4745. doi: 10.1038/s41467-022-32290-4
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ISSN of the journal2041-1723
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