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2005
Structure
D 2000
25- 003
Crystal and Magnetic Structures of the Mn3+ Orbital Ordered Manganite
YBaMn2O5.5. — The title compound crystallizes in the space group Icma with Z = 4
as determined by Rietveld refinement of powder X-ray and neutron diffraction data.
The structure contains two distinct types of Mn3+ cations, in square pyramidal and
octahedral coordination, leading to the formation of a particular orbital ordering. The
signs of the exchange interaction deduced from the corresponding orbital ordering are
in good agreement with the observed magnetic structure. The compound is an insulator
at all measured temperatures, showing an activated conductivity, Ea ≅ 0.22 eV. —
(PERCA, C.; PINSARD-GAUDART*, L.; DAOUD-ALADINE, A.;
FERNANDEZ-DIAZ, M. T.; RODRIGUEZ-CARVAJAL, J.; Chem. Mater. 17 (2005)
7, 1835-1843; Lab. Phys.-Chim. Rayonnem., Univ. Paris-Sud, F-91405 Orsay, Fr.;
Eng.) — W. Pewestorf
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