Helical magnetism and structural anomalies in triangular lattice α-SrCr2O4

S. E. Dutton, E. Climent-Pascual, P. W. Stephens, J. P. Hodges, A. Huq, C. L. Broholm, R. J. Cava

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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 - 596K and a three-dimensional magnetic ordering temperature of 43K, 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 100K and an inflection in the cell parameters at the magnetic ordering temperature. These anomalies indicate the presence of a moderate degree of magnetostructural coupling.

Original languageEnglish (US)
Article number246005
JournalJournal of Physics Condensed Matter
Volume23
Issue number24
DOIs
StatePublished - Jun 22 2011

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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