Scientific article
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Nuclear and magnetic spin structure of the antiferromagnetic triangular lattice compound LiCrTe2 investigated by μ+SR, neutron and X-ray diffraction

Published inScientific reports, vol. 12, no. 1, 21657
Publication date2022-12-15
First online date2022-12-15

Two-dimensional (2D) triangular lattice antiferromagnets (2D-TLA) often manifest intriguing physical and technological properties, due to the strong interplay between lattice geometry and electronic properties. The recently synthesized 2-dimensional transition metal dichalcogenide LiCrTe $$_2$$ 2 , being a 2D-TLA, enriched the range of materials which can present such properties. In this work, muon spin rotation ( $$\mu ^+$$ μ + SR) and neutron powder diffraction (NPD) have been utilized to reveal the true magnetic nature and ground state of LiCrTe $$_2$$ 2 . From high-resolution NPD the magnetic spin order at base-temperature is not, as previously suggested, helical, but rather collinear antiferromagnetic (AFM) with ferromagnetic (FM) spin coupling within the ab -plane and AFM coupling along the c -axis. The value if the ordered magnetic Cr moment is established as $$\mu _{\textrm{Cr}}= 2.36~\mu _{\textrm{B}}$$ μ Cr = 2.36 μ B . From detailed $$\mu ^+$$ μ + SR measurements we observe an AFM ordering temperature $$T_{\textrm{N}}\approx 125$$ T N ≈ 125 K. This value is remarkably higher than the one previously reported by magnetic bulk measurements. From $$\mu ^+$$ μ + SR we are able to extract the magnetic order parameter, whose critical exponent allows us to categorize LiCrTe $$_2$$ 2 in the 3D Heisenberg AFM universality class. Finally, by combining our magnetic studies with high-resolution synchrotron X-ray diffraction (XRD), we find a clear coupling between the nuclear and magnetic spin lattices. This suggests the possibility for a strong magnon–phonon coupling, similar to what has been previously observed in the closely related compound LiCrO $$_2$$ 2 .

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Citation (ISO format)
NOCERINO, E. et al. Nuclear and magnetic spin structure of the antiferromagnetic triangular lattice compound LiCrTe<sub>2</sub> investigated by <i>μ</i>+SR, neutron and X-ray diffraction. In: Scientific reports, 2022, vol. 12, n° 1, p. 21657. doi: 10.1038/s41598-022-25921-9
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Article (Published version)
ISSN of the journal2045-2322

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Creation01/31/2023 1:02:00 PM
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