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We report on experimental studies of the character of phase transitions inthe quasi-1D organic compound (TMTSF)2PF6 in the close vicinity of the bordersbetween the paramagnetic metal PM, antiferromagnetic insulator AF, andsuperconducting SC states. In order to drive the system through the phaseborder P_0(T_0), the sample was maintained at fixed temperature T and pressureP, whereas the critical pressure P_0 was tuned by applying the magnetic fieldB. In this approach, the magnetic field was used (i) for tuning (P-P_0), and(ii) for identifying the phase composition (due to qualitatively differentmagnetoresistance behavior in different phases). Experimentally, we measuredR(B) and its temperature dependence R(B,T) in the pressure range (0 - 1)GPa.Our studies focus on the features of the magnetoresistance at the phasetransition between the PM and AF phases, in the close vicinity to thesuperconducting transition at T~1K. We found pronounced history effects arisingwhen the AF/PM phase border is crossed by sweeping the magnetic field: theresistance depends on a trajectory which the system arrives at a given point ofthe P-B-T phase space. In the transition from the PM to AF phase, the featuresof the PM phase extends well into the AF phase. At the opposite transition fromthe AF to PM phase, the features of the AF phase are observed in the PM phase.These results evidence for a macroscopically inhomogeneous state, whichcontains macroscopic inclusions of the minority phase. When the system isdriven away from the transition, the homogeneous state is restored; upon areturn motion to the phase boundary, no signatures of the minority phase areobserved up to the very phase boundary.Comment: 10 figures, 23 page

physical review. b, condensed matter and materials physics

Macroscopically inhomogeneous state at the boundary between the superconducting, antiferromagnetic, and metallic phases in quasi-one-dimensional<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo>(</mml:mo><mml:mi mathvariant="normal">TMTSF</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">PF</mml:mi></mml:mrow><mml:mrow><mml:mn>6…

Macroscopically inhomogeneous state at the boundary between the superconducting, antiferromagnetic, and metallic phases in quasi-one-dimensional(TMTSF)2PF6…