CHARGE-DENSITY-WAVE INSTABILITIES EXPECTED IN MONOPHOSPHATE TUNGSTEN BRONZES

On the basis of tight-binding band calculations, we examined the electronic structures of the tungsten oxide layers found in the monophosphate tungsten bronze (MPTB) phases. The Fermi surfaces of these MPTB phases consist of five well-nested one- and two-dimensional pieces. We calculated the nesting vectors of these Fermi and discussed the expected charge-density-wave instabilities.