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Papers by Author: I.V. Medvedeva

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Variation of Electroresistive Properties of Nanocrystalline Nd_0.7Sr_0.3MnO₃ by Thermobaric Treatment under a Pressure of 9 GPa

Authors: I.V. Medvedeva, T. Dyachkova, A. Tyutyunnik, Y. Zaynulin, V. Marchenkov, E. Marchenkova, C.P. Yang, S.S. Chen, K. Bärner

Abstract: Polycrystalline Nd1-xSrxMnO3 was subjected to a thermobaric treatment, that is, a quenching under a high quasihydrostatic pressure of 9 GPa , starting from the temperature 1000 °C. This results in a strong change of the electroresistive and magnetoresistive properties. The changes in the electrical transport might result from the increase of oxygen deficient regions in the boundaries between the nanosized grains.

Role of Electronic Band Structure and Lattice Parameters in Magnetism of the R₂(Fe,M)₁₇, М = Si, Al Compounds

Authors: Anatoly G. Kuchin, Yu.V. Knyazev, Y.I. Kuz’min, A.V. Lukoyanov, I.A. Nekrasov, V.I. Anisimov, N.I. Kourov, I.V. Medvedeva, V.I. Voronin

Abstract: Magnetic, electronic, structural and magnetovolume properties of the R2Fe17-xMx (R = Y, Lu, Ce; M = Si or Al) compounds were studied. We pioneered to apply electronic band parameters determination to account for the anomalous volume dependence of ferromagnetism in these compounds.

Spectral and Time-Resolved Photoresponse in Nd_2/3Sr_1/3MnO_3-d Epitaxial Layers

Authors: A. Kattwinkel, R. Braunstein, L. Haupt, N. Hamad, K. Bärner, E. Gommert, J. Wecker, R.V. Helmolt, I.V. Medvedeva

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