Abstract
Results of magnetization and neutron diffraction measurements of the manganese vanadate system Mn5(VO4)2(OH)4 are reported. The crystal structure of this compound contains triangular [Mn3O13] building blocks that produce two-dimensional Mn2+ magnetic networks with striped triangular topologies. The Mn sheets are connected through the nonmagnetic vanadate tetrahedra extending along the a-axis. Magnetization measurements performed on single crystals reveal the onset of a long-range antiferromagnetic order below approximately 45 K. The magnetic structure is Néel-type with nearest-neighbor Mn atoms coupled via three or four antiferromagnetic bonds. The magnetic moments are confined within the layers and are oriented parallel to the b direction. The magnitudes of ordered moments are reduced, presumably by geometrical frustration and the low-dimensionality of the lattice structure.
Highlights
The roles played by frustration and quantum fluctuations on the magnetic ordering of antiferromagnetic systems with spins residing on triangular lattices continue to be the subject of intense research
The strong divergence between the curves measured with magnetic fields applied along the two crystallographic directions suggests that the ordered magnetic moments are predominantly along the b direction
Magnetization measurements indicate a magnetic order at 45 K and a field-induced spin-reorientation transition at approximately 35 kOe for a magnetic field applied along the b-direction
Summary
We show that this system orders in an antiferromagnetic state with non-uniform static moment distribution and it exhibits a field-induced spin-reorientation transition
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