Localized to Itinerant Electronic Transition in Perovskite Oxides, Volume 98
Springer Science & Business Media, Feb 26, 2001 - Science - 239 pages
Interest in the transition metal oxides with perovskite related structures goes back to the 1950s when the sodium tungsten bronzes NaxWO3 were shown to be metallic [1 ], the system Lal_xSr~MnO3 was found to contain a ferromagnetic conductive phase , and La0.sSr0.sCoO3 was reported to be a ferromagnetic metal, but with a peculiar magnetization of 1.5 #a/Co atom . Stoichiometric oxide perovskites have the generic formula AMO3 in which the A site is at the center of a simple cubic array of M sites; the oxide ions form (180 ° 4)) M O M bridges to give an MO3 array of corner shared MO6/2 octahedra and the larger A cations have twelvefold oxygen coordination. Mismatch between the A O and M O equilibrium bond lengths introduces internal stresses. A compressive stress on the MO3 array is accommodated by a lowering of the M O M bond angle from 180 ° to (180 ° 4)); a tensile stress on the M O M bonds is accommodated by the formation of hexagonal polytypes .
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A!_xAxMnO3 antiferromagnetic Arima atoms band bandwidth bond length c-axis charge carriers charge ordering charge-ordered Cheong S-W clusters colossal magnetoresistance configuration correlation coupling cuprates decreasing diffraction doping double-exchange Drude model dynamic Egami electron-lattice electronic correlations energy Fermi ferroelectric ferromagnetic ferromagnetic phase first-order FM phase Goodenough JB holes Hubbard increases ionic ions itinerant electronic behavior itinerant-electron JT distortion kbar La!_xSrxCoO3 La2_xSrxCuO4 LaCoO3 LaMnO3 LaTiO3 lattice localized to itinerant magnetic field magnetic order magnetoresistance manganites matrix metal-insulator transitions metallic phase Mott-Hubbard transition Neel temperature observed octahedra optical conductivity orbital ordering orthorhombic oxides paramagnetic parameter perovskites phase diagram phase segregation phonon Phys Rev Lett planes polarons pressure Raman scattering range Rev B 58 Rev B 60 sample Solid State Chem spectral weight spin stabilized structure superconductive superexchange interactions temperature dependence Tokura tolerance factor transfer transition metal Uchida volume Zener polarons Zhou J-S
Page 115 - T. EGAMI Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104-6272, USA G.