We report a comparative study of the specific heat, electrical resistivity, and thermal conductivity of the quasi-two-dimensional purple bronzes Na 0.9Mo 6O 17 and K 0.9Mo 6O 17, with special emphasis on the behavior near their respective charge-density-wave transition temperatures T P. The contrasting behavior of both the transport and the thermodynamic properties near T P is argued to arise predominantly from the different levels of intrinsic disorder in the two systems. A significant proportion of the enhancement of the thermal conductivity above T P in Na 0.9Mo 6O 17, and to a lesser extent in K 0.9Mo 6O 17, is attributed to the emergence of phason excitations.
|Original language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - May 2 2012|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics