Magnetic spiral order in the square-lattice spin system (CuBr)Sr2Nb3O10

• Published in: Physica. B, Condensed matter Vol. 599; p. 412533
• Main Authors: Mikheyenkov, A.V., Valiulin, V.E., Barabanov, A.F.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.12.2020; Elsevier BV
• Subjects: (CuBr)Sr2Nb3O10; Broken symmetry; Frustration; Heisenberg model; Heisenberg theory; Magnetic fields; Magnetic properties; Magnetism; Neutrons; Square lattice; Statistical models; Symmetry; Thermodynamic properties; Thermodynamics; Two dimensional models; Heisenberg model; (CuBr)Sr2Nb3O10; Square lattice; Thermodynamic properties; Frustration
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/j.physb.2020.412533

We address quantum spin helical states in the strongly frustrated Heisenberg model. Contrary to conventional Dzyaloshinskii–Moriya approach we show that such states appear without central symmetry breaking. As an example, we demonstrate that the magnetic and thermodynamic properties of the quasi-two-dimensional square-lattice compound (CuBr)Sr2Nb3O10 can be interpreted within 2D S=1∕2J1−J2−J3 Heisenberg model. In this compound neutron experiment indicates helical spin order while central symmetry does hold. •Strongly frustrated J1−J2−J3 Heisenberg model can be used to describe quasi-two-dimensional compounds with helicoidal spin order, when the Dzyaloshinsky-Moria interaction is inconsistent.•We demonstrate that the magnetic and thermodynamic properties of the quasi-two-dimensional square-lattice compound (CuBr)Sr2Nb3O10 can be interpreted within quantum J1−J2−J3 Heisenberg model.•This work will help researchers in theoretical describing a rich variety of experimental compounds with helicoidal spin order, where inversion symmetry is preserved.