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Rozenberg, E.,Shames, A. I.,Jung, G.,Mukovskii, Ya. M.,Sominski, E.,Gedanken, A.,Lee, Cheol Eui Wiley - VCH Verlag GmbH & Co. KGaA 2007 Physica status solidi. B Vol. No.
<P>Electron spin resonance was studied on three (two bulk and one nanometer sized) samples of the same La<SUB>0.7</SUB>Ca<SUB>0.3</SUB>MnO<SUB>3</SUB> manganite compound aiming to compare their magnetic homogeneities. The results obtained show that both ceramic and single crystalline bulk samples are less homogeneous than nano-crystalline one. Except for higher homogeneity, the nano sample demonstrates also a weaker magnetic anisotropy. As a result, well pronounced coexistence of different magnetic phases (coexistence of ferromagnetic and paramagnetic resonance signals) is observed in bulk samples, while it is absent in nano. It is suggested that such strong difference is directly connected to the difference in structural state of the samples. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)</P>
Rozenberg, E.,Tsindlekht, M.I.,Felner, I.,Sominski, E.,Gedanken, A.,Mukovskii, Ya.M.,Cheol Eui Lee IEEE 2009 IEEE transactions on magnetics Vol.45 No.6
<P>AC and dc magnetic measurements in temperature interval 5-350 K and at external magnetic field H les 5 T were employed to probe the finite-size and nonstoichiometry effects on magnetic ordering of La<SUB>0.5</SUB>Ca<SUB>0.5</SUB>MnO<SUB>3</SUB> half-doped manganite compound. It is shown that the complex mixed magnetic ordering in bulk samples appears to be unstable regarding the both effects. The strongest one is the size effect, suppressing the mixed order and inducing the ferromagnetic-like one, which is characteristic also for other half-doped manganites. The small variations in cation composition (nonstoichiometry), which don't influence the crystal structure, lead to strong perturbations in the mixed magnetic ordering of the bulk. The results obtained are discussed in the terms of pronounced competition of spin, charge and lattice degrees of freedom, characteristic for doped manganites.</P>