Helical magnetism and structural anomalies in triangular lattice α-SrCr2O4

Abstract

α-SrCr2O4 has a triangular planar lattice of d3 Cr3+ made from edge sharing CrO6 octahedra; the plane shows a very small orthorhombic distortion from hexagonal symmetry. With a Weiss temperature of -596 K and a three-dimensional magnetic ordering temperature of 43 K, the magnetic system is quasi two-dimensional and frustrated. Neutron powder diffraction shows that the ordered state is an incommensurate helical magnet, with an in-plane propagation vector of k = (0,0.3217(8),0). Temperature dependent synchrotron powder diffraction characterization of the structure shows an increase in the inter-plane spacing on cooling below 100 K and an inflection in the cell parameters at the magnetic ordering temperature. These anomalies indicate the presence of a moderate degree of magneto-structural coupling.

19 pages, 6 figures

References in corpus (7)

• Triangular Antiferromagnets
• Quasi two-dimensional antiferromagnet on a triangular lattice RbFe(MoO4)2
• Electric Polarization Induced by a Proper Helical Magnetic Ordering in a Delafossite Multiferroic CuFe1-xAlxO2
• Non-Collinear Magnetic Phases of a Triangular-Lattice Antiferromagnet and Doped CuFeO${}_2$
• Helical magnetic state in the distorted triangular lattice of alpha-CaCr2O4
• Co-existing chiral and collinear phases in a distorted triangular antiferromagnet
• Spin-lattice order in frustrated ZnCr2O4

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