Abstract
We report the 16.5 GHz microwave response of single crystal samples of (TMTSF${)}_{2}$${\mathrm{AsF}}_{6}$ at temperatures from 1.7--20 K as a function of external magnetic field. With the field applied along the hard (${\mathit{c}}^{\mathrm{*}}$) axis direction, striking changes are observed below ${\mathit{T}}_{\mathit{c}}$ in the microwave dielectric constant and conductivity, which are similar to (but more clear than) those reported in the ${\mathrm{PF}}_{6}$ salt. Following small changes in the low-temperature dielectric response, we are able to resolve the field dependence of the 3.5 and 1.9 K condensate phase boundaries. For the field applied along the chain direction, no changes are observed. Emphasis is placed upon the analysis of the H-T diagram (H\ensuremath{\parallel}${\mathit{c}}^{\mathrm{*}}$) and the series of subphases within the spin-density-wave manifold.
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