Transport and thermodynamic properties of quasi-two-dimensional purple bronzes A 0.9Mo 6O 17 (A=Na, K)

Xiaofeng Xu, A. F. Bangura, C. Q. Niu, M. Greenblatt, Song Yue, C. Panagopoulos, N. E. Hussey

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Abstract

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 languageEnglish (US)
Article number195101
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number19
DOIs
StatePublished - May 2 2012

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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