Collective spin-density-wave response perpendicular to the chains of the quasi-one-dimensional conductor ${\left(\mathrm{TMTSF}\right)}_2\mathrm{P}{\mathrm{F}}_6$

Microwave experiments along all three directions of the spin-density-wave model compound ${\left(\mathrm{TM}\text{−}\mathrm{TSF}\right)}_2\mathrm{P}{\mathrm{F}}_6$ reveal that the pinned mode resonance is present along the $a$ and $b^{\prime }$ axes. The collective transport is considered to be the fingerprint of the condensate. In contrast to common quasi-one-dimensional models, the density wave also slides in the perpendicular $b^{\prime }$ direction. The collective response is absent along the least conducting $c^{*}$ direction.

Figure 1

Sketch of the frequency-dependent SDW conductivity composed using data along the chain axis of ${\left(\mathrm{TMTSF}\right)}_2\mathrm{P}{\mathrm{F}}_6$. (Ref. 4). The solid arrows indicate the position of single particle gap and the pinned mode resonance in the microwave frequency range. The dashed arrow depicts the frequency range of the investigations presented in this work.

Figure 2

Arrhenius plot of the temperature dependent dc resistivity of ${\left(\mathrm{TMTSF}\right)}_2\mathrm{P}{\mathrm{F}}_6$ along the $a$, $b^{\prime }$, and $c^{*}$ directions.

Figure 3

Temperature dependent microwave resistivity of ${\left(\mathrm{TMTSF}\right)}_2\mathrm{P}{\mathrm{F}}_6$ along the $a$, $b^{\prime }$, and $c^{*}$ directions measured at 33.5 GHz.

Figure 4

Schematic Fermi surface nesting of a quasi-one-dimensional system with interchain coupling in the $b$ direction.