Helical magnetism and structural anomalies in triangular lattice α-SrCr2O4

Details Helical magnetism and structural anomalies in triangular lattice α-SrCr2O4 Helical magnetism and structural anomalies in triangular lattice α-SrCr2O4

2011-02-15

arxiv.org/abs/1102.3125v1

J. Phys.: Condens. Matter 23 246005 2011

Physics

Condensed Matter

Strongly Correlated Electrons

19 pages, 6 figures

Scientific paper

10.1088/0953-8984/23/24/246005

{\alpha}-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.

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