Orbital polarons and optical conductivity in doped manganites | Zendy

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Orbital polarons and optical conductivity in doped manganites

Author(s) -

Bała J.

Publication year - 2005

Publication title -

physica status solidi (b)

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.51

H-Index - 109

eISSN - 1521-3951

pISSN - 0370-1972

DOI - 10.1002/pssb.200460044

Subject(s) - polaron , condensed matter physics , optical conductivity , doping , conductivity , electrical resistivity and conductivity , ferromagnetism , paramagnetism , electron paramagnetic resonance , manganite , materials science , physics , chemistry , nuclear magnetic resonance , electron , quantum mechanics

Orbital polaron formation and the optical conductivity σ ( ω ) is investigated in the ferromagnetic and paramagnetic phases of doped ( x = 1/4) manganites. Using finite‐temperature diagonalization techniques for a realistic spin–orbital model we find the three‐site correlations specific for the orbital polarized state and the σ ( ω ) which is characterized by a broad spectrum with pronounced optical gap due to polaron formation. At small frequencies ( ω < t ) the conductivity is dominated by an incoherent spectrum with spectral weight decreasing with increasing temperature leading to an activated behavior in resistivity above T c . (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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