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  • Helical magnetism and structural anomalies in triangular lattice α-SrCr2O4.

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

Journal of physics. Condensed matter : an Institute of Physics journal (2011-06-01)
S E Dutton, E Climent-Pascual, P W Stephens, J P Hodges, A Huq, C L Broholm, R J Cava
ABSTRACT

α-SrCr(2)O(4) has a triangular planar lattice of d(3) Cr(3+) made from edge sharing CrO(6) 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 magnetostructural coupling.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Chromium(III) oxide, powder, ≥98%
Sigma-Aldrich
Chromium(III) oxide, powder, 99.9% trace metals basis
Sigma-Aldrich
Chromium(III) oxide, nanopowder, <100 nm particle size (TEM), 98% trace metals basis