TY - JOUR
T1 - Incoherent charge dynamics in perovskite manganese oxides
AU - Nakano, Hiroki
AU - Motome, Yukitoshi
AU - Imada, Masatoshi
PY - 2000/5
Y1 - 2000/5
N2 - A minimal model is proposed for the perovskite manganese oxides showing strongly incoherent charge dynamics with a suppressed Drude weight in the ferromagnetic and metallic phase near the insulator. We investigate a generalized double-exchange model which includes three elements; the orbital degeneracy of eg conduction bands, the Coulomb interaction and fluctuating Jahn-Teller distortions. We demonstrate that Lanczös diagonalization calculations combined with Monte Carlo sampling of the largely fluctuating lattice distortions result in the optical conductivity which quantitatively accounts for the experimental indications. It is found that all three elements are indispensable for understanding the charge dynamics in these compounds.
AB - A minimal model is proposed for the perovskite manganese oxides showing strongly incoherent charge dynamics with a suppressed Drude weight in the ferromagnetic and metallic phase near the insulator. We investigate a generalized double-exchange model which includes three elements; the orbital degeneracy of eg conduction bands, the Coulomb interaction and fluctuating Jahn-Teller distortions. We demonstrate that Lanczös diagonalization calculations combined with Monte Carlo sampling of the largely fluctuating lattice distortions result in the optical conductivity which quantitatively accounts for the experimental indications. It is found that all three elements are indispensable for understanding the charge dynamics in these compounds.
KW - Coulomb interaction
KW - Double-exchange model
KW - Drude weight
KW - Exact diagonalization
KW - Ferromagnetic metal
KW - Incoherent charge dynamics
KW - Jahn-Teller distortion
KW - Metal-insulator transition
KW - Optical conductivity
KW - Orbital degeneracy
KW - Perovskite manganites
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U2 - 10.1143/JPSJ.69.1282
DO - 10.1143/JPSJ.69.1282
M3 - Article
AN - SCOPUS:0034392764
VL - 69
SP - 1282
EP - 1285
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 5
ER -