Magnetic and dielectric order in the kagome-like francisite Cu${}_3$Bi(SeO${}_3$)${}_2$O${}_2$Cl

Abstract

We report a single-crystal neutron diffraction and inelastic neutron scattering study on the spin 1/2 cuprate Cu${}_3$Bi(SeO${}_3$)${}_2$O${}_2$Cl, complemented by dielectric and electric polarization measurements. The study clarifies a number of open issues concerning this complex material, whose frustrated interactions on a kagome-like lattice, combined with Dzyaloshinskii-Moriya interactions, are expected to stabilize an exotic canted antiferromagnetic order. In particular, we determine the nature of the structural transition occurring at 115 K, the magnetic structure below 25 K resolved in the updated space group, and the microscopic ingredients at the origin of this magnetic arrangement. This was achieved by an analysis of the measured gapped spin waves, which signifies the need of an unexpected and significant anisotropic exchange beyond the proposed Dzyaloshinskii-Moriya interactions. Finally, we discuss the mutliferroic properties of this material with respect to the space group symmetries.

References in corpus (9)

• Spin Liquid Ground State of the $S=1/2$ Kagome Heisenberg Model
• Spin Dynamics of the Spin-1/2 Kagome Lattice Antiferromagnet ZnCu_3(OH)_6Cl_2
• Theory of antiferroelectric phase transitions
• Gapless chiral spin liquid in a kagome Heisenberg model
• Infrared phonon anomaly and magnetic excitations in single-crystal Cu${}_3$Bi(SeO${}_3$)${}_2$O${}_2$Cl
• Magnetic ground state and 2D behavior in pseudo-Kagome layered system Cu3Bi(SeO3)2O2Br
• Frustration and Dzyaloshinsky-Moriya anisotropy in the kagome francisites Cu${}_3$Bi(SeO${}_3{)}_2$O${}_2$X
• Antiferroelectric instability in kagome francisites Cu${}_3$Bi(SeO${}_3$)${}_2$O${}_2$X (X = Cl, Br)
• Helical order and multiferroicity in the $S=1/2$ quasi-kagome system KCu${}_3$As${}_2$O${}_7$(OD)${}_3$

Cited by in corpus (9)

• Quantum Magnetism in Minerals
• Archetypal soft-mode driven antipolar transition in francisite Cu3Bi(SeO3)2O2Cl
• Cooperative cluster-Jahn-Teller effect as a possible route to antiferroelectricity
• Longitudinal magnon, inversion breaking and magnetic instabilities in the pseudo-Kagome francisites Cu3Bi(SeO3)2O2X with X=Br, Cl
• Magnetism of coupled spin tetrahedra in ilinskite-type KCu${}_5$O${}_2$(SeO${}_3$)${}_2$Cl${}_3$
• Linear magnetoelastic coupling and magnetic phase diagrams of the buckled-kagomé antiferromagnet Cu${}_3$Bi(SeO${}_3$)${}_2$O${}_2$Cl
• Antipolar transitions in GaNb${}_4$Se${}_8$ and GaTa${}_4$Se${}_8$
• Frustration relief and reorientation transition in the kagome-like dolerophanite Cu${}_2$OSO${}_4$
• Evidence for a soft-phonon-mode-driven Peierls-type distortion in Sc${}_3$CoC${}_4$