Electronic and ionic transport properties and other physical aspects of perovskites

Details Electronic and ionic transport properties and other physical aspects of perovskites Electronic and ionic transport properties and other physical aspects of perovskites

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004rpph...67.1915g&link_type=abstract

Reports on Progress in Physics, Volume 67, Issue 11, pp. 1915-1993 (2004).

Physics

60

Scientific paper

The perovskites and perovskite-related structures exhibit several features of technical as well as fundamental interest. Technically useful properties include oxide-ion conduction with/without electronic conduction, oxidation catalysis, ferroic displacements in classic and relaxor ferroelectrics, half-metallic ferromagnetism and high-temperature superconductivity. Of more fundamental interest is the ability to tune, by chemical substitution on the large-cation subarray, transition-metal oxides through the crossover on the transition-metal array from localized dn configurations to itinerant d-electron behaviour without/with changing the valence state of that array. The localized-electron configurations may exhibit cooperative Jahn-Teller distortions that introduce anisotropic exchange interactions. At crossover, bond-length fluctuations may segregate into an ordered array of alternating covalent and ionic bonding in a single-valent perovskite; multicentre polarons or correlation bags may replace small polarons in a mixed-valent system. Bond-length fluctuations at crossover give vibronic conduction and suppression of the phonon contribution to the thermal conductivity; the fluctuations may order, to give high-temperature superconductivity, or transform to quantum-critical-point behaviour at lowest temperatures. Crossover of sgr-bonding electrons in the presence of localized spins associated with pgr-bonding electrons gives rise to the colossal magnetoresistance phenomenon above a ferromagnetic Curie temperature.

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