Non-Fermi-Liquid Behavior in Transport in(TMTSF)2PF6

Abstract

It has recently been suggested that the highly anisotropic organic conductor ${\mathrm{}\left(\mathrm{TMTSF}\right)\mathrm{}}_2$P${\mathrm{F}}_6$ is marginally a three-dimensional Fermi liquid which can be destabilized by a small field in the intermediate conducting b direction, $H_b$. This field would cause the interplane transport to become incoherent. We examine the 3D Fermi surface and find it coherent for $H_b=0\mathrm{}$ and incoherent or nonexistent for small $H_b$. At similar $H_b$ the magnetoresistances become power laws in the field applied perpendicular to the conducting planes (${\rho }_a\propto H_{\perp }^{\frac{1}{2}}$ and ${\rho }_c\propto H_{\perp }^{\frac{3}{2}}$). These are 2D, non-Fermi-liquid properties.