Abstract
We report an unexpected magnetic-field-driven magnetic structure in the 5f-electron Shastry- Sutherland system U2Pd2In. This phase develops at low temperatures from a noncollinear antiferromagnetic ground state above the critical field of 25.8 T applied along the a-axis. All U moments have a net magnetic moment in the direction of the applied field, described by a ferromagnetic propagation vector qF = (0 0 0) and an antiferromagnetic component described by a propagation vector qAF = (0 0.30 1/2 ) due to a modulation in the direction perpendicular to the applied field. We conclude that this surprising noncollinear magnetic structure is due to a competition between the single-ion anisotropy trying to keep moments, similar to the ground state, along the [110]-type directions, Dzyaloshinskii-Moryia interaction forcing them to be perpendicular to each other and application of the external magnetic field attempting to align them along the field direction.
Highlights
Magnetic frustration, competition between two or more exchange interactions, and Dzyaloshinskii-Moryia interaction (DMI) commonly lead to either formation of strongly reduced magnetic moments, canted magnetic structures, or even more exotic magnetic states such as spin ice and spin liquids [1,2,3,4,5,6]
Due to a modulation in the direction perpendicular to the applied field. We conclude that this surprising noncollinear magnetic structure is due to a competition between the single-ion anisotropy trying to keep moments, similar to the ground state, along the [110]-type directions, Dzyaloshinskii-Moryia interaction forcing them to be perpendicular to each other and application of the external magnetic field attempting to align them along the field direction
We report on neutron diffraction experiments on a Shastry-Sutherland model system U2Pd2In in DC magnetic fields up to 26 T combined with pulsed fields up to 45 T applied along the a axis
Summary
Competition between two or more exchange interactions, and Dzyaloshinskii-Moryia interaction (DMI) commonly lead to either formation of strongly reduced magnetic moments, canted magnetic structures, or even more exotic magnetic states such as spin ice and spin liquids [1,2,3,4,5,6]. The Shastry-Sutherland (SS) model (and related models), which is exactly solvable [7], is well known to be a playground for studies of frustrated magnets. Only a handful of systems are known to adopt this type of lattice. SrCu2(BO3)2 [8,9,10], which is nonmagnetic at low temperatures in zero field, is the most widely studied material. Application of magnetic field, pressure, and low-level doping lead to novel magnetic phases studied frequently with high-field and/or neutron scattering techniques. It has been shown that under such perturbations SrCu2(BO3) exhibits a magnetic order. TmB4 and GdB4 [11,12] can be named as two other examples of experimental realization of the SS lattice
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