Structural and magnetic behavior of LaMnO3+δ and LaMn0.9Cr0.1O3+δ at the same “hole concentration”

L.B. MORALES; J. RODRIGUEZ CARVAJAL; A. CANEIRO

JOURNAL OF ALLOYS AND COMPOUNDS

ELSEVIER SCIENCE SA

Lugar: Amsterdam; Año: 2004 vol. 369 p. 97 - 100

0925-8388

We report a comparative magnetic and a neutron powder diffraction (NPD) study of un-doped LaMnO3+δ (δ = 0.05 and 0.09) and Cr dopedLaMn0.9Cr0.1O3+δ (δ = 0.00 and 0.04) with the same “hole concentration”.Samples with controlled oxygen contents were prepared by annealing at different temperatures and p(O2) values. The refinement of theneutron powder diffraction data at 2K shows that the AFM components for the Cr doped samples are higher than those of the un-dopedones for the same “hole concentration”. The FC and ZFC dc magnetization measurements versus T under 100 Oe also reveal a strong AFMcharacter for the Cr-doped samples. These results clearly show a different role in the magnetic interactions for samples doped with Cr3+ andMn4+ ions.