On the transport and thermodynamic properties of quasi-two-dimensional purple bronzes A${}_{0.9}$Mo${}_6$O${}_{17}$ (A=Na, K)

Abstract

We report a comparative study of the specific heat, electrical resistivity and thermal conductivity of the quasi-two-dimensional purple bronzes Na${}_{0.9}$Mo${}_6$O${}_{17}$ and K${}_{0.9}$Mo${}_6$O${}_{17}$, 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${}_{0.9}$Mo${}_6$O${}_{17}$, and to a lesser extent in K${}_{0.9}$Mo${}_6$O${}_{17}$, is attributed to the emergence of phason excitations.

8 pages, 6 figures, To appear in Physical Review B

References in corpus (3)

• Directional field-induced metallization of quasi-one-dimensional Li${}_{0.9}$Mo${}_6$O${}_{17}$
• Violation of the isotropic-$\ell$ approximation in overdoped La_{2-x}Sr_xCuO_4
• Spin thermal conductivity of the Haldane chain compound Y2BaNiO5

Cited by in corpus (3)

• Upward curvature of the upper critical field and the V-shaped pressure dependence of $T_c$ in the noncentrosymmetric superconductor PbTaSe${}_2$
• Charge Density Waves and the Hidden Nesting of Purple Bronze K${}_{0.9}$Mo${}_6$O${}_{17}$
• Origin of a Superlattice Observed in Li${}_{0.9}$Mo${}_6$O${}_{17}$ by Scanning Tunneling Microscopy