令和 4年度（２０２２年度）第5回 物理教室談話会

Title	Title：Incommensurate and multiple-q magnetic misfit order in the frustrated quantum spin ladder material antlerite, Cu3SO4(OH)4
Speaker	Dr. Darren Peets Institut für Festkörper- und Materialphysik, Technische Universität Dresden, Germany
Date and time	November 10, 2022 (Thu) 14 : 00
Place	Class Room No.11 on the 1F, Faculty of Science Building
abstract	In frustrated magnetic systems, the competition amongst interactions can introduce extremely high degeneracy and prevent the system from readily selecting a unique ground state. In such cases, the magnetic order is often exquisitely sensitive to the balance among the interactions, allowing tuning among novel magnetically ordered phases. We present antlerite, Cu3SO4(OH)4, as a potential platform for tuning frustration. Contrary to previous reports, the low-temperature magnetic state of its three-leg zigzag ladders is a quasi-one-dimensional analogue of the magnetic state recently proposed to exhibit spinon-magnon mixing in botallackite [1]. In addition to this low-temperature phase of coupled ferromagnetic and antiferromagnetic spin chains, in zero field antlerite hosts an incommensurate helical+cycloidal state, an idle-spin state, and a multiple-q phase which is the magnetic analog of misfit crystal structures [2]. The antiferromagnetic order on the central leg is reentrant. Density functional theory calculations indicate that antlerite’s magnetic ground state is exquisitely sensitive to fine details of the atomic positions [3], with each chain independently on the cusp of a quantum phase transition, indicating an excellent potential for tunability, and making antlerite a particularly promising platform for pursuing exotic magnetic order. leaflet References: H. Zhang, et al., Phys. Rev. Lett. 125, 0372024 (2020). A. A. Kulbakov et al., arXiv:2207.05606. 3 A. A. Kulbakov et al., Phys. Rev. B 106, L020405 (2022).
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