The square-lattice spiral magnet Ba_2CuGe_2O_7 in an in-plane magnetic field

Abstract

The magnetic structure of Ba_2CuGe_2O_7 is investigated by neutron diffraction in magnetic fields applied along several directions in the $(a,b)$ plane of the crystal. In relatively weak fields, $H\lesssim 0.5$~T, the propagation vector of the spin-spiral rotates to form a finite angle with the field direction. This angle depends on the orientation of $H$ itself. The rotation of the propagation vector is accompanied by a re-orientation of the plane of spin rotation in the spiral. The observed behaviour is well described by a continuous-limit form of a free energy functional that includes exchange and Dzyaloshinskii-Moriya interactions, as well as the Zeeman energy and an empirical anisotropy term.

7 pages, 6 figures

References in corpus (1)

• Field-induced Commensurate-Incommensurate phase transition in a Dzyaloshinskii-Moriya spiral antiferromagnet

Cited by in corpus (13)

• Magnetic structures and reorientation transitions in noncentrosymmetric uniaxial antiferromagnets
• Magnetic anisotropy and low-energy spin waves in the Dzyaloshinskii-Moriya spiral magnet Ba_2 Cu Ge_2 O_7
• Experimental evidence for Shekhtman-Entin-Wohlman-Aharony (SEA) interactions in Ba2CuGe2O7
• Spin waves and the origin of commensurate magnetism in Ba2CoGe2O7
• Interplay between Symmetric Exchange Anisotropy, Uniform Dzyaloshinskii-Moriya Interaction and Magnetic Fields in the Phase Diagram of Quantum Magnets and Superconductors
• Phase Diagram of the Dzyaloshinskii-Moriya Helimagnet Ba2CuGe2O7 in Canted Magnetic Fields
• Intermediate phase in the spiral antiferromagnet Ba_2CuGe_2O_7
• Double-k phase of the Dzyaloshinskii-Moriya helimagnet Ba2CuGe2O7
• Magnetic structures, spin-flop transition and coupling of Eu and Mn magnetism in the Dirac semimetal EuMnBi${}_2$
• Field induced phase transitions in the helimagnet Ba2CuGe2O7
• Symmetry breaking in spin spirals and skyrmions by in-plane and canted magnetic fields
• Formation of incommensurate long-range magnetic order in the Dzyaloshinskii-Moriya antiferromagnet Ba${}_2$CuGe${}_2$O${}_7$ studied by neutron diffraction
• Noncollinear magnetic structure in U2Pd2In at high magnetic fields