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29 March 2024
 
  » arxiv » cond-mat/0111175

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Spectral properties of the Holstein double-exchange model and application to manganites
M. Hohenadler ; D. M. Edwards ;
Date 9 Nov 2001
Journal J. Phys.: Condes. Matter 14 (2002) 2547-2560
Subject Strongly Correlated Electrons; Materials Science | cond-mat.str-el cond-mat.mtrl-sci
AbstractCalculations of one-electron spectral functions, optical conductivity and spin-wave energy in the Holstein double-exchange model are made using the many-body coherent potential approximation. Satisfactory agreement is obtained with angle-resolved photoemission results on La_1.2Sr_1.8Mn_2O_7 and optical measurements on Nd_0.7Sr_0.3MnO_3. A pseudogap in the one-electron spectrum at the Fermi level plays an important role in both systems, but a small-polaron band is only predicted to exist in the La system. A rigorous upper bound on spin-wave energies at T=0 is derived. The spin-wave stiffness constant D decreases with increasing electron-phonon coupling g in a similar way to the Curie temperature Tc, but D/(k_B Tc) increases for large g (low Tc) as observed experimentally.
Source arXiv, cond-mat/0111175
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