Disorder-induced phase coexistence in bulk doped manganites and its suppression in nanometer-sized crystals: The case of La_{0.9}Ca_{0.1}MnO_3 Academic Article uri icon

abstract

  • X-band electron magnetic resonance together with dc and ac magnetic measurements were employed for comparative study of magnetic ordering in bulk and nanometer-sized La 0.9 Ca 0.1 Mn O 3 single crystals. A dramatic difference between bulk crystal showing mixed magnetic state, constituted by coexisting canted antiferromagnetic A-type matrix and nanometer sized ferromagnetic clusters, and the nanocrystalline form of the same compound, showing mainly ferromagnetic ordering, has been revealed. The complementary study of the structural state and analysis of the electron paramagnetic resonance data in terms of the proposed theoretical model have enlightened the reasons for the observed difference in the magnetic order. The results suggest that the change in magnetic order has an intrinsic nature and is not induced by nonstoichiometry. The cation composition and …

publication date

  • December 1, 2007