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(Institut für Festkörper- und Materialphysik, Technische Universität Dresden, Germany))

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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