Oxigen Deficiency on Magnetic, Magnetoresistive and Magnetoelastic Properties of La1-xSrxMnO3-y Manganitesстатья
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Дата последнего поиска статьи во внешних источниках: 19 июля 2013 г.
Аннотация:The influence of oxygen deficiency on magnetization, paramagnetic susceptibility,
electrical resistivity, magnetoresistance and magnetostriction of La1-xSrxMnO3-y (x = 0,0.2, 0.4; y=0, 0.13, 0.2) is studied. These properties demonstrate that the ferro – antiferromagnetic magnetic two-phase state are in the oxygen deficiency samples. In samples with y ¹ 0 in lattice sites, in which the oxygen ions are absent, electrons in twos are disposed from maintenance of a crystal electroneutrality. They partially (in x = 0.4, y = 0.13) or fully (in x = 0.4, y = 0.2; x = 0.2, y = 0.13,0.2) compensate single-charge acceptors (Sr2+ ions). In non-compensated donors two electron spins are antiparallel and do not form of the ferromagnetic nanoregions from the s-d exchange gain(ferrons). In sites of lattice with the oxygen vacancies the broken Mn-O-Mn connections present which break the ferromagnetic exchange interactions in them decreasing the middle magnetization in samples with x = 0.2, 0.4 and y = 0.13 and provoking a transition to superparamagnetic behavior in samples with x = 0.2, 0.4 and y = 0.2.