Code: 11KO Metallic Oxides
Lecturer: Ing. Jiĝí Hejtmánek CSc. Weekly load: 2 Completion: EX
Department: 14111 Credits: 2 Semester: S
Crystal structures, chemical composition and characteristic electronic properties of oxides is presented. Namely electronic and thermal transport, specific heat, thermoelectric coefficient, magnetic interactions and long range magnetic order are discussed. Phase transitions as a consequence of mutual interplay of lattice, transport and magnetic effects and metal-insulator transition tuned via chemical composition and temperature are documented. Orbital, spin and charge ordered (disordered) states are exemplified using the salient oxide families - colossal magnetoresistance manganites, high temperature superconducting cuprates and cobalt oxide thermoelectrics.
1. structure and chemical composition of characteristic oxide families and their bonding characteristics. 2. electronic properties of oxides, role of crystal field and correlations. 3. specific heat from low to high temperatures, Schottky contribution. 4. magnetic interactions and long range magnetic order, examples of magnetic structures, dynamic and static interactions, superexchange and double-exchange, low and high spin state. 5. electron and thermal transport, thermal conductivity and thermoelectric coefficient. 6. phase transitions as a mutual consequence of elastic (lattice), electron and magnetic interactions, metal-insulator transition, role of chemical composition, temperature and disorder. Characteristic groups of oxides 7. binary oxides, examples and stoichiometry 8. orbital, spin and a charge order in manganite perovskites, orderd vs. disordered ground state, the stability of ground-state and the impact of external fields. 9. other magnetic oxides, spin polarized transport, colossal and giant magnetoresistance 10. oxides with lowered dimensionality, delafossites and bronzes 11. oxide thermoelectic materials, cobaltites (p-type) and mangantites (n-type) 12. high temperature superconducting cuprates and ruthenates - principles, examples, coexistence of magnetism and superconductivity 13. application prospects - spin valve, superconducting applications, high temperature thermoelectrics
Recommended literature:
Key references: ^^[1]. J.B.Godenough: Prog. Solid State Chem., 5, 145 (1971). ^^Recommended references: ^^[2]. N.C.Mott: Metal - insulator transitions, Taylor and Francis , 2-nd edition including HTS cuprates(1990), ^^[3]. J.M.Ziman: Principles of the theory of solids (2-nd edition) Cambridgee Univ. press (1972), ^^[4]. P.A.Cox: Transitinon metal oxides, Clarendon Press.-Oxford (1995), ^^[5]. Ed. P. P. Edwards and C. N. R. Rao, The metallic and non metallic states of matter, Taylor and Francis (1985).
Metallic oxides, thermal and charge carrier transport, phase and metal-insulator transitions, magnetic, charge and orbital order

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