Influence of Oxigen Deficiency on Magnetic, Magnetoresistive and Magnetoelastic Properties of La_1-xSr_xMnO_3-y Manganites

Abstract:

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  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.

• Periodical: Solid State Phenomena (Volumes 152-153)
• Pages: 139-142
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.152-153.139
• Online since: April 2009
• Authors: D.M. Zashchirinskii, L.A. Koroleva, T.M. Khapaeva, L.I. Gurskii, N.A. Kalanda, B.M. Trukhan
• Keywords: Magnetic Two-Phase State, Magnetisation, Magnetoresistivity MR, Manganite

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