講演会のお知らせ 　(11/10：Dr. Darren Peets
(Institut für Festkörper- und Materialphysik, Technische Universität Dresden, Germany))

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.

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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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