Helical magnetism and structural anomalies in triangular lattice α-SrCr2O4

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 i...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2011-06, Vol.23 (24), p.246005-246005
Main Authors: Dutton, S E, Climent-Pascual, E, Stephens, P W, Hodges, J P, Huq, A, Broholm, C L, Cava, R J
Format: Article
Language:English
Subjects:
Chromates - chemistry
Chromium Compounds - chemistry
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
CURIE-WEISS LAW
DIFFRACTION
Exact sciences and technology
Inorganic compounds
Magnetic properties and materials
Magnetically ordered materials: other intrinsic properties
Magnetics
MAGNETISM
Molecular Conformation
NEUTRONS
Physics
Salts
Saturation moments and magnetic susceptibilities
Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)
Strontium - chemistry
Structure of solids and liquids
crystallography
Structure of specific crystalline solids
SYMMETRY
SYNCHROTRONS
Temperature
VECTORS
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Summary: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.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/23/24/246005