We present simultaneous measurements of angular-dependent
magnetoresistance and thermopower along all three crystal axes in
(TMTSF)(2)PF6 for pressures to 7.4 kbar and magnetic fields to 35 T.
(TMTSF)(2)PF6 under pressure shows the coexistence of spin density wave
and metal-superconducting orders. We suggest that this coexistence
results neither in microscopic coexistence nor in a new soliton wall
phase, contrary to previous suggestions, but in phase separation into
domains of the high-pressure metal and the low-pressure spin density
wave phases. Simultaneous measurement of transport along all crystal
axes allows us to unambiguously describe the domain structure, whereas
the superconducting transition temperature and four independent Fermi
surface-sensitive magnetoresistance signatures allow us to unambiguously
characterize the coexisting metallic domains.
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