Physics
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..899..263k&link_type=abstract
SIXTH INTERNATIONAL CONFERENCE OF THE BALKAN PHYSICAL UNION. AIP Conference Proceedings, Volume 899, pp. 263-264 (2007).
Physics
Manganites, Spin Arrangements In Magnetically Ordered Materials, Exchange And Superexchange Interactions, Colossal Magnetoresistance
Scientific paper
The crystal and magnetic structures of the manganese oxide family Bi0.25RE0.25A0.5MnO3 (RE = La, Nd, Ho, Tm; A = Sr, Ca) were investigated by high resolution neutron diffraction. The half bismuth substitution for rare earth entails unusual structural distortions that make the manganese octahedra rather different from that in the non-substituted compounds. The findings for Ca-Bi manganites indicate an anisotropic expansion of the manganese octahedra and that the 6s2 lone electronic pair of Bi3+ cations is rather constrained than dominant. The CE-type antiferromagnetic ordering takes place in the Bi-Ca series while a part of the low temperature evidence for Bi-Sr members is in support to the phase separation conception.
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