Physics of Transition Metal OxidesThe fact that magnetite (Fe304) was already known in the Greek era as a peculiar mineral is indicative of the long history of transition metal oxides as useful materials. The discovery of high-temperature superconductivity in 1986 has renewed interest in transition metal oxides. High-temperature su perconductors are all cuprates. Why is it? To answer to this question, we must understand the electronic states in the cuprates. Transition metal oxides are also familiar as magnets. They might be found stuck on the door of your kitchen refrigerator. Magnetic materials are valuable not only as magnets but as electronics materials. Manganites have received special attention recently because of their extremely large magnetoresistance, an effect so large that it is called colossal magnetoresistance (CMR). What is the difference between high-temperature superconducting cuprates and CMR manganites? Elements with incomplete d shells in the periodic table are called tran sition elements. Among them, the following eight elements with the atomic numbers from 22 to 29, i. e. , Ti, V, Cr, Mn, Fe, Co, Ni and Cu are the most im portant. These elements make compounds with oxygen and present a variety of properties. High-temperature superconductivity and CMR are examples. Most of the textbooks on magnetism discuss the magnetic properties of transition metal oxides. However, when one studies magnetism using tradi tional textbooks, one finds that the transport properties are not introduced in the initial stages. |
Contents
| 1 | |
| 3 | |
Cuprates | 37 |
References | 96 |
Manganites | 167 |
Titanates and Vanadates | 224 |
Cobaltates | 241 |
Quantum Effects in Orbitally Degenerate Systems | 261 |
A Optical Conductivity | 310 |
| 332 | |
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Physics of Transition Metal Oxides Sadamichi Maekawa,Takami Tohyama,Stewart Edward Barnes No preview available - 2014 |
Common terms and phrases
3d electrons anisotropy antiferromagnetic axis bond bosons carriers charge chemical potential condensate correlation corresponds Coulomb interaction coupling crystal structure Cu-O CuO2 plane cuprates degeneracy degrees of freedom density diagonal dimensional discussed dispersion distortion doping effective eg orbitals energy exchange interaction excitation Fermi fermion ferromagnetic finite fluctuations flux Hamiltonian Heisenberg hole holon hopping integral Hubbard band Hubbard model insulating cuprates ions lattice Lett Maekawa magnetic magnon manganites matrix elements mean-field momentum Mott insulators Néel octahedron operators optical orbital degree orbital order orbiton order parameter oxygen particle perovskite phase phonon Phys physical quantum quasiparticle rotation scattering Sect shown in Fig singlet spectral function spin and orbital spin wave spin-orbital Sr2CuO3 sub-lattice superconductivity superexchange interaction symmetry t-J model t2g orbitals temperature theory thermopower Tokura transition metal transition metal oxides vector wave function zero