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Electronic structure of p-type La1 − x M 2+ x MnO3 manganites in the ferromagnetic and paramagnetic phases in the LDA + GTB approach

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Abstract

The band structure, spectral intensity, and position of the Fermi level in doped p-type La1 − x M x/2+MnO3 manganites (M = Sr, Ca, Ba) is analyzed using the LDA + GBT method for calculating the electronic structure of systems with strong electron correlations, taking into account antiferro-orbital ordering and using the Kugel-Khomskii ideas and real spin S = 2. The results of the ferromagnetic phase reproduce the state of a spin half-metal with 100% spin polarization at T = 0, when the spectrum is of the metal type for a quasiparticle with one spin projection and of the dielectric type for the other. It is found that the valence band becomes approximately three times narrower upon a transition to the paramagnetic phase. For the paramagnetic phase, metal properties are observed because the Fermi level is located in the valence band for any nonzero x. The dielectrization effect at the Curie temperature is possible and must be accompanied by filling of d x orbitals upon doping. The effect itself is associated with strong electron correlations, and a complex structure of the top of the valence band is due to the Jahn-Teller effect in cubic materials.

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Authors and Affiliations

  1. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russia

    V. A. Gavrichkov & S. G. Ovchinnikov

  2. Siberian Federal University, Krasnoyarsk, 660041, Russia

    V. A. Gavrichkov & S. G. Ovchinnikov

  3. Institute of Electrophysics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620016, Russia

    I. A. Nekrasov

  4. Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620990, Russia

    Z. V. Pchelkina

Authors
  1. V. A. Gavrichkov
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  2. S. G. Ovchinnikov
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  3. I. A. Nekrasov
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  4. Z. V. Pchelkina
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Correspondence to V. A. Gavrichkov.

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Original Russian Text © V.A. Gavrichkov, S.G. Ovchinnikov, I.A. Nekrasov, Z.V. Pchelkina, 2011, published in Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2011, Vol. 139, No. 5, pp. 983–1000.

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Gavrichkov, V.A., Ovchinnikov, S.G., Nekrasov, I.A. et al. Electronic structure of p-type La1 − x M 2+ x MnO3 manganites in the ferromagnetic and paramagnetic phases in the LDA + GTB approach. J. Exp. Theor. Phys. 112, 860–876 (2011). https://doi.org/10.1134/S1063776111030101

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