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Inhomogeneity of the ferromagnetic state of (La1−x Srx)1−δMnO3 perovskites according to 139La and 55Mn NMR data

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Abstract

The paper presents results obtained in studying 139La and 55Mn nuclear magnetic resonance spectra and nuclear magnetic relaxation in the temperature range 21–220 K augmented by data on the magnetic and transport properties of ferromagnetic (La1−x Srx)1−δMnO3 manganites (x=0, 0.075, and 0.125, δ≈0.0−0.05). The transition from the ferromagnetic state with semiconductor-type conductivity to the ferromagnetic state with metallic conductivity as the degree of doping x increased was related to the redistribution of the volumes of two phases (two types of regions) with different degrees of freedom of electron holes on manganese sites. The ferromagnet-paramagnet phase transition was a smooth redistribution of the volumes of ferromagnetic and paramagnetic (or antiferromagnetic) regions in a wide temperature range. Ferromagnetic conductivity was caused by the “double exchange” mechanism, whereas, in comparatively nonconducting regions, double exchange was considerably weakened and involved fairly slow thermally activated motion of Jahn-Teller polarons. The dynamics of nuclear spins was evidence of internal inhomogeneity of each of these phases.

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Authors and Affiliations

  1. Donetsk Physicotechnical Institute, National Academy of Sciences of Ukraine, Donetsk, 83114, Ukraine

    M. M. Savosta, V. D. Doroshev, V. I. Kamenev, V. A. Borodin, T. N. Tarasenko & A. S. Mazur

  2. Institute of Physics, Academy of Sciences of the Czech Republic, 18221, Praha 8, Czech Republic

    M. Maryško

Authors
  1. M. M. Savosta
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  2. V. D. Doroshev
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  3. V. I. Kamenev
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  4. V. A. Borodin
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  5. T. N. Tarasenko
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  6. A. S. Mazur
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Additional information

__________

Translated from Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 124, No. 3, 2003, pp. 633–649.

Original Russian Text Copyright © 2003 by Savosta, Doroshev, Kamenev, Borodin, Tarasenko, Mazur, Maryško.

Deceased.

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Savosta, M.M., Doroshev, V.D., Kamenev, V.I. et al. Inhomogeneity of the ferromagnetic state of (La1−x Srx)1−δMnO3 perovskites according to 139La and 55Mn NMR data. J. Exp. Theor. Phys. 97, 573–586 (2003). https://doi.org/10.1134/1.1618342

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  • DOI: https://doi.org/10.1134/1.1618342

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