Spectral properties of the Holstein double-exchange model and application to manganites

Details Spectral properties of the Holstein double-exchange model and application to manganites Spectral properties of the Holstein double-exchange model and application to manganites

2001-11-09

arxiv.org/abs/cond-mat/0111175v2

J. Phys.: Condes. Matter 14 (2002) 2547-2560

Physics

Condensed Matter

Strongly Correlated Electrons

15 pages, 5 figures

Scientific paper

10.1088/0953-8984/14/10/306

Calculations 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.

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