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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
KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.ORCID iD: 0000-0003-4441-8882
Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest-Ansermet, 1211, Geneva 4, Switzerland, 24 Quai Ernest-Ansermet; Department of Physics, University of Zürich, Winterthurerstr. 190, 8057, Zurich, Switzerland, Winterthurerstr. 190.
Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo, 679-5198, Japan, 1-1-1 Kouto.
Department of Physics, Chalmers University of Technology, 412 96, Göteborg, Sweden.ORCID iD: 0000-0001-8879-7875
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2022 (English)In: Scientific Reports, E-ISSN 2045-2322, Vol. 12, no 1, article id 21657Article in journal (Refereed) Published
Abstract [en]

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 LiCrTe2, being a 2D-TLA, enriched the range of materials which can present such properties. In this work, muon spin rotation (μ+SR) and neutron powder diffraction (NPD) have been utilized to reveal the true magnetic nature and ground state of LiCrTe2. 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 μCr=2.36μB. From detailed μ+SR measurements we observe an AFM ordering temperature TN≈ 125 K. This value is remarkably higher than the one previously reported by magnetic bulk measurements. From μ+SR we are able to extract the magnetic order parameter, whose critical exponent allows us to categorize LiCrTe2 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 LiCrO2.

Place, publisher, year, edition, pages
Springer Nature , 2022. Vol. 12, no 1, article id 21657
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Condensed Matter Physics
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URN: urn:nbn:se:kth:diva-328715DOI: 10.1038/s41598-022-25921-9ISI: 001003026900008PubMedID: 36522382Scopus ID: 2-s2.0-85144152912OAI: oai:DiVA.org:kth-328715DiVA, id: diva2:1765447
Note

QC 20230610

Available from: 2023-06-10 Created: 2023-06-10 Last updated: 2023-12-07Bibliographically approved

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Nocerino, ElisabettaForslund, Ola KenjiMatsubara, NamiMånsson, Martin

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