INVESTIGADORES
SERQUIS Adriana Cristina
artículos
Título:
Comment on "Magnetoresistance and phase composition of La-Sn-Mn-O systems"
Autor/es:
A. CANEIRO; L. MORALES; F. PRADO; R. D. SÁNCHEZ; A. SERQUIS
Revista:
PHYSICAL REVIEW B - CONDENSED MATTER AND MATERIALS PHYSICS
Editorial:
American Physical Society
Referencias:
Año: 2000 vol. 62 p. 6825 - 6826
ISSN:
0163-1829
Resumen:
In a published paper by Li et al. [Phys. Rev. B 60, 10284 (1999)] the transport properties and phase composition of the manganites La1-xSnxMnO3+δ (x=0.1-0.5) are studied. The authors analyze their results assuming the existence of two phases: a perovskite LaMnO3+δ and a pyrochlore (La0.5Sn0.5)2Mn2O7. We consider that they misinterpret the x-ray diffraction data and we conclude that the manganites La1-xSnxMnO3+δ are in fact a multiphase material composed by LaMnO3+δ, La2Sn2O7, Mn3O4, and SnO2. The magnetic transition observed by Mössbauer experiments around 65 K attributed by Li et al. to that of the (La0.5Sn0.5)2Mn2O7 pyrochlore phase would correspond to that of the paramagnetic-ferrimagnetic one of Fe-doped Mn3O4.