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

Sara A. López-Paz (), Zurab Guguchia, Vladimir Y. Pomjakushin, Catherine Witteveen, Antonio Cervellino, Hubertus Luetkens, Nicola Casati, Alberto F. Morpurgo and Fabian O. von Rohr ()
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Sara A. López-Paz: University of Geneva
Zurab Guguchia: Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut
Vladimir Y. Pomjakushin: Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut
Catherine Witteveen: University of Geneva
Antonio Cervellino: Laboratory for Synchrotron Radiation - Condensed Matter, Paul Scherrer Institut
Hubertus Luetkens: Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut
Nicola Casati: Laboratory for Synchrotron Radiation - Condensed Matter, Paul Scherrer Institut
Alberto F. Morpurgo: University of Geneva
Fabian O. von Rohr: University of Geneva

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: 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 TN ≈ 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 Ts ≈ 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.

Date: 2022
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DOI: 10.1038/s41467-022-32290-4

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