Phys. Rev. B 61, 13545–13559 (2000)Effects of magnetic ordering on the anisotropy and temperature dependence of the optical conductivity in LaMnO3: A tight-binding approachSee Also: Erratum Received 14 January 1999; revised 29 November 1999; published in the issue dated 15 May 2000 A tight-binding parametrization of the band structure, along with a mean-field treatment of the Hund, electron-electron, and electron-lattice couplings, is used to obtain the full optical conductivity tensor of LaMnO3 as a function of temperature. We predict striking changes with temperature in the functional form and magnitude of the optical absorption. Comparison of our results with existing data makes it possible to determine the electron-lattice and electron-electron couplings. The effective “Hubbard U” is found to be ≈1.6 eV, rather less than the full bandwidth ≈3.6 eV, putting the material in the weak-intermediate coupling regime. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.61.13545
DOI:
10.1103/PhysRevB.61.13545
PACS:
78.20.Bh, 71.20.Be, 72.15.Gd
See AlsoErratum: K. H. Ahn and A. J. Millis, Erratum: Effects of magnetic ordering on the anisotropy and temperature dependence of the optical conductivity in LaMnO3: A tight-binding approach [Phys. Rev. B 61, 13 545 (2000)], Phys. Rev. B 63, 209902 (2001). |
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