Structure, phase transitions, 55Mn NMR and magnetoresistive properties of Pr0.6-xNdxSr0.3Mn 1.1O3-δ (x = 0-0.6)

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Pashchenko, A.V.
Pashchenko, V.P.
Prokopenko, V.K.
Revenko, Yu.F.
Mazur, A.S.
Sychova, V.Ya.
Burkhoveckiy, V.V.
Kisel, N.G.
Sil'cheva, A.G.
Liedienov, N.A.
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Fizika Nizkikh Temperatur | 2014年 / 40卷 / 08期
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The ceramic sampels of Pr0.6-xNdxSr 0.3Mn1.1O3-δ (x = 0-0.6) were studied by the x-ray diffraction; resis-tive; magnetic (Xac and 55Mn NMR); magnetoresistive and electron microscopy methods. It is shown that with increasing concentration x the type of unit cell distortion changes from orthorhombic (x = 0-0.2) to pseudocubic one (x = 0.4-0.6); and the structure im-perfection containing anion and cation vacancies is enhanced. Decreas in temperatures of the phase transi-tions metal-semiconductor Tms and ferro-paramag-netic TC; increases in resistivity and activation energy with increasing x may be explained by in increasing va-cancy concentration; that diminishes the high-frequency electronic double exchange Mn3+Mn4+. It is found that compositions with a higher content of neodymium demonstrate the transition to an antiferromagnetic state at temperatures below 130 K. There are two types of magnetoresistive effect. The value of the first effect; which shows itself near the phase transition tempera-tures Tms and TC; increases with concentration x. The value of the second effect observed at low temperatures exceeds the first one. The phase diagrams of magnetic state are constructed. They describe the strong correla-tion relationship between composition; structure defects; phase transition and functional propertie; including the magnetoresistive effect. © A.V. Pashchenko; V.P; Pashchenko; V.K; Prokopenko; Yu.F; Revenko; A.S; Mazur; V.Ya; Sychova; V.V; Burkhoveckiy; N.G; Kisel; A.G; Sil'cheva; and N.A. Liedienov 2014;
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页码：922 / 931
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