THE ROLE OF HYDROGEN-BONDS FOR ELECTRONIC-PROPERTIES IN TRANSITION-METAL COMPOUNDS

The role of hydrogen-bonds playing for electronic properties is studie d from the theoretical viewpoint in two kinds of transition-metal (TM) compounds: halogen-bridged mixed-valence TM-complexes (type I) and pe rovskite-type hole-doped TM-oxides under hydrogen-containing atmospher e (type II). It is discussed that the correlation among charge-density -wave chains (type I) and the electric conduction (type II) can be con trolled by the proton motion on the hydrogen-bonds in these compounds.