Size effect on the structural, magnetic, and magnetotransport properties of electron doped manganite La0.15Ca0.85MnO3статья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Nanocrystalline La0.15Ca0.85MnO3 samples of various grain sizes ranging from 17 to 42 nm
have been prepared by sol-gel technique. Phase purity and composition were verified by room
temperature x-ray diffraction and SEM-EDAX analysis. The bulk La0.15Ca0.85MnO3 is known
to order antiferromagnetically around 170K and to undergo a simultaneous crystal structural
transition. DC magnetization measurements on 17 nm size La0.15Ca0.85MnO3 show a peak at
130K (TN) in zero-field-cooled (ZFC) state. Field-cooled magnetization bifurcates from ZFC
data around 200K hinting a weak ferromagnetic component near room temperature due to
surface moments of the nanoparticle sample. Low temperature powder neutron diffraction
experiments reveal that the incomplete structural transition from room temperature orthorhombic to low temperature orthorhombic-monoclinic state also occurs in the nanoparticle sample as in the bulk. Magnetization in the ordered state decreases as particle size increases, thus indicating the reduction of the competing ferromagnetic surface moments.