TY - JOUR
T1 - Tetragonal lattice instability and monoclinic distortion in A-type antiferromagnetic La0.4Sr0.6MnO3 manganites
AU - Dho, Joonghoe
AU - Ki, Sanghoon
PY - 2014/12
Y1 - 2014/12
N2 - The microstructural properties of A-type antiferromagnet La 0.4Sr0.6MnO3 were investigated through Rietveld analysis of neutron power diffraction data. Above 240 K, the temperature dependence of lattice parameters of the tetragonal structure exhibited a negative slope for c/2 and a positive slope for a (=b). An increase of tetragonality ((c/2)/a) on cooling probably causes a lattice instability, which may trigger a structural distortion to a monoclinic structure. At ∼240 K, the A-type spin/orbital ordering was presumably related to the two dimensional-like anisotropic structural distortion (ΔaΔc+0.9% and Δb/2=-2.0%) and a significant volume discontinuity ΔV/V∼0.002. These microscopic structural changes were attributed to a distortion of the MnO6 octahedron, which results in a change in the Mn-O bond length and Mn-O-Mn bond angles.
AB - The microstructural properties of A-type antiferromagnet La 0.4Sr0.6MnO3 were investigated through Rietveld analysis of neutron power diffraction data. Above 240 K, the temperature dependence of lattice parameters of the tetragonal structure exhibited a negative slope for c/2 and a positive slope for a (=b). An increase of tetragonality ((c/2)/a) on cooling probably causes a lattice instability, which may trigger a structural distortion to a monoclinic structure. At ∼240 K, the A-type spin/orbital ordering was presumably related to the two dimensional-like anisotropic structural distortion (ΔaΔc+0.9% and Δb/2=-2.0%) and a significant volume discontinuity ΔV/V∼0.002. These microscopic structural changes were attributed to a distortion of the MnO6 octahedron, which results in a change in the Mn-O bond length and Mn-O-Mn bond angles.
KW - A. Oxides
KW - C. Neutron scattering
KW - D. Crystal structure
UR - http://www.scopus.com/inward/record.url?scp=84940291332&partnerID=8YFLogxK
U2 - 10.1016/j.jpcs.2014.07.016
DO - 10.1016/j.jpcs.2014.07.016
M3 - Article
AN - SCOPUS:84940291332
SN - 0022-3697
VL - 75
SP - 1372
EP - 1375
JO - Journal of Physics and Chemistry of Solids
JF - Journal of Physics and Chemistry of Solids
IS - 12
ER -