Magnetic and dielectric order in the kagomelike francisite Cu3Bi( SeO3) 2O2Cl

E. Constable (1) , S. Raymond (2) , S. Petit (3) , E. Ressouche (2) , F. Bourdarot (2) , J. Debray (4) , Michaël Josse (5) , O. Fabelo (6) , H. Berger (7) , S. de Brion (1) , V. Simonet (1)

1 NEEL - MagSup - Magnétisme et Supraconductivité
2 MDN - Magnétisme et Diffusion Neutronique
3 LLB - UMR 12 - Laboratoire Léon Brillouin
4 NEEL - CrisMass - Cristaux massifs
5 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
6 ILL - Institut Laue-Langevin
7 EPFL - Ecole Polytechnique Fédérale de Lausanne

We report a single-crystal neutron diffraction and inelastic neutron scattering study on the spin 1/2 cuprate Cu3Bi(SeO3)2O2Cl, complemented by dielectric and electric polarization measurements. The study clarifies a number of open issues concerning this complex material, whose frustrated interactions on a kagomelike 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 for an unexpected and significant anisotropic exchange beyond the proposed Dzyaloshinskii-Moriya interactions. Finally, we discuss the multiferroic properties of this material with respect to the space group symmetries.

Domaines: Electrons fortement corrélés [cond-mat.str-el]

E. Constable, S. Raymond, S. Petit, E. Ressouche, F. Bourdarot, et al.. Magnetic and dielectric order in the kagomelike francisite Cu3Bi( SeO3) 2O2Cl. Physical Review B, 2017, 96 (1), pp.014413. ⟨10.1103/PhysRevB.96.014413⟩. ⟨hal-01632255⟩