Weak trimerization in the frustrated two-dimensional triangular Heisenberg antiferromagnet LuyY1−yMnO3

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dc.contributor.authorYano, Sen_AU
dc.contributor.authorWang, CWen_AU
dc.contributor.authorGardner, JSen_AU
dc.contributor.authorChen, WTen_AU
dc.contributor.authorIida, Ken_AU
dc.contributor.authorMole, RAen_AU
dc.contributor.authorLouca, Den_AU
dc.date.accessioned2024-10-03T21:17:04Zen_AU
dc.date.available2024-10-03T21:17:04Zen_AU
dc.date.issued2023-06-02en_AU
dc.date.statistics2023-09-04en_AU
dc.description.abstractTo understand the 2D triangular Heisenberg antiferromagnetic system, we investigated the magnetic structures and the dynamics of LuyY1-yMnO3 in detail. The substitutions are adjusted to the Mn atomic position close to xMn=13. The neutron powder diffraction data claims that the magnetic structure of LuyY1-yMnO3 is described as a mixture of Γ3 (P63′cm′) and Γ4 (P63′c′m) at the xMn position for y=0.15, 0.30, and 0.45. The ratio of Γ3 and Γ4 depends on temperature and composition and the fraction of Γ3 increases upon cooling, while no clear trimerization was observed at the xMn position. We estimated exchange parameters from the analysis of the low-energy part of the spin waves. The results showed a weak trimerization effect on cooling because the nearest-neighbor exchange interaction is slightly enhanced. The temperature dependence of the spin-wave dispersion around the Γ point shows that the spin gap closes with increasing temperature because the exchange interactions in the nearest Mn-Mn neighbor become smaller. Gapless diffusive magnetic excitation from a Mn triangular lattice has been observed in a wide range in Q and E space of LuyY1-yMnO3. We found that Lu0.3Y0.7MnO3 could be an ideal case to investigate the trimerization, frustrated magnetism, and magnetoelastic coupling often observed in two-dimensional triangular lattice Heisenberg antiferromagnet systems. ©2023 American Physical Societyen_AU
dc.description.sponsorshipFinancial support of the neutron-scattering instrument Sika from the Ministry of Science and Technology, Taiwan, (Grant No. MOST 109-2739-M-213-001) are gratefully acknowledged. S.Y. is financially supported by the National Science and Technology Council, Taiwan, with Grants No. 110-2112-M-213-013 and No. 111-2112-M-213-023. W.-T.C. is partially supported by the National Science and Technology Council, Taiwan, with Grants No. 110-2124-M-002-019 and No. 111-2124-M-002-020-, and Academia Sinica with Project No. AS-iMATE-111-12. D.L. is supported by the Department of Energy (DOE) through Grant No. DE-FG02-01ER45927. The experiments were performed under the ANSTO user program. The proposal numbers are Pelican (P4341) and Sika (P7830).en_AU
dc.identifier.articlenumber214407en_AU
dc.identifier.citationYano, S., Wang, C.-W., Gardner, J. S., Chen, W.-T., Iida, K., Mole, R. A., & Louca, D. (2023). Weak trimerization in the frustrated two-dimensional triangular Heisenberg antiferromagnet LuyY1−yMnO3. Physical Review B, 107(21), 214407. doi:10.1103/PhysRevB.107.214407en_AU
dc.identifier.issn2469-9950en_AU
dc.identifier.issn2469-9969en_AU
dc.identifier.issue21en_AU
dc.identifier.journaltitlePhysical Review Ben_AU
dc.identifier.urihttp://dx.doi.org/10.1103/physrevb.107.214407en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15710en_AU
dc.identifier.volume107en_AU
dc.languageEnglishen_AU
dc.language.isoenen_AU
dc.publisherAmerican Physical Societyen_AU
dc.subjectHeisenberg modelen_AU
dc.subjectAntiferromagnetismen_AU
dc.subjectLutetiumen_AU
dc.subjectManganeseen_AU
dc.subjectDiffractionen_AU
dc.subjectSpin wavesen_AU
dc.subjectCouplingen_AU
dc.titleWeak trimerization in the frustrated two-dimensional triangular Heisenberg antiferromagnet LuyY1−yMnO3en_AU
dc.typeJournal Articleen_AU
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