Spin States and Electronic Conduction in Ni Oxides

摘要

During the 1950's, semiconduction for thermoelectricity was the objective ofintense research in mixed-valence transition-metal oxides. An important focus of these investigations was the electrical conductivity of the monoxide Li(x)M(1-x)O families, measured as functions of temperature and composition to determine the thermal activation energy of the electron hopping mechanism in the presence of magnetic superexchange, particularly for the antiferromagnetic host nickel oxide. Since high-critical temperature superconductivity (high Tc) has now been discovered in perovskite-related Cu oxides, electronic conduction in the monoxides should be reexamined in the light of this unexpected phenomenon. Keywords: Reprints, Ni Oxides, Mixed valence, Low spin, Nickel, Spin states, Polaron mobility and magnetic exchange, Activation energies, Superconductors, Lithium, Copper. (jg)