The Essential Interactions in Oxides and Spectral Weight Transfer in Doped Manganites

Abstract

We calculate the value of the Fröhlich electron-phonon interaction in manganites, cuprates, and some other charge-transfer insulators and show that this interaction is much stronger than any relevant magnetic interaction. A polaron shift due to the Fröhlich interaction, which is about 1 eV, suggests that carriers in those systems are small (bi)polarons at all temperatures and doping levels, in agreement with the oxygen isotope effect and other data. An opposite conclusion, recently suggested in the literature, is shown to be incorrect. The frequency and temperature dependence of the optical conductivity of ferromagnetic manganites is explained within the framework of the bipolaron theory.

6 pages, REVTeX 3.1 with 3 eps-figures. Journal version

References in corpus (6)

• Carrier Density Collapse and Colossal Magnetoresistance in Doped Manganites
• Mobile small polaron
• Polaron Absorption in a Perovskite Manganite La0.7Ca0.3MnO3
• Theory of Colossal Magnetoresistance in Doped Manganites
• The Density of States of hole-doped Manganites: A Scanning Tunneling Microscopy/Spectroscopy study
• Colossal magnetooptical conductivity in doped manganites

Cited by in corpus (18)

• Extrinsic Magnetotransport Phenomena in Ferromagnetic Oxides
• Ferromagnetism and electron-phonon coupling in the manganites
• Electrical transport in the ferromagnetic state of manganites: Small-polaron metallic conduction at low temperatures
• Low-Temperature Permittivity of Insulating Perovskite Manganites
• Phase coexistence and resistivity near the ferromagnetic transition of manganites
• Impurity Conduction and Magnetic Polarons in Antiferromagnetic Oxides
• Polaron Transport in the Paramagnetic Phase of Electron-Doped Manganites
• High Temperature Superconductivity: the explanation
• Pairing mechanism of high-temperature superconductivity: Experimental constraints
• Dielectric anomaly at T_N in LaMnO3
• Revealing polarons with high pressure on low electron-doped manganites
• Optical conductivity of polaronic charge carriers
• Evidence for very strong electron-phonon coupling in YBa_{2}Cu_{3}O_{6}
• Pairing interactions and pairing mechanism in high temperature copper oxide superconductors
• Effect of screening of the electron-phonon interaction on mass renormalization and optical conductivity of the Extended Holstein model polarons
• Theory of SIS tunnelling in cuprates
• Polaron and bipolaron dispersion curves in one dimension for intermediate coupling
• Strain Fields and Critical Phenomena in Manganites I: Spin-Lattice Hamiltonians