Influence of Oxigen Deficiency on Magnetic, Magnetoresistive and Magnetoelastic Properties of La1-xSrxMnO3-y Manganites

Abstract:

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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.

Info:

Periodical:

Solid State Phenomena (Volumes 152-153)

Edited by:

N. Perov

Pages:

139-142

DOI:

10.4028/www.scientific.net/SSP.152-153.139

Citation:

D.M. Zashchirinskii et al., "Influence of Oxigen Deficiency on Magnetic, Magnetoresistive and Magnetoelastic Properties of La1-xSrxMnO3-y Manganites", Solid State Phenomena, Vols. 152-153, pp. 139-142, 2009

Online since:

April 2009

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$35.00

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