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Magnetoresistance measurements on the quasi one-dimensional organic conductor(TMTSF)_2PF_6 performed in magnetic fields B up to 16T, temperatures T down to0.12K and under pressures P up to 14kbar have revealed new phases on its P-B-Tphase diagram. We found a new boundary which subdivides the field induced spindensity wave (FISDW) phase diagram into two regions. We showed that alow-temperature region of the FISDW diagram is characterized by a hysteresisbehavior typical for the first order transitions, as observed in a number ofstudies. In contrast to the common believe, in high temperature region of theFISDW phase diagram, the hysteresis and, hence, the first order transitionswere found to disappear. Nevertheless, sharp changes in the resistivity slopeare observed both in the low and high temperature domains indicating that thecascade of transitions between different subphases exists over all range of theFISDW state. We also found that the temperature dependence of the resistance(at a constant B) changes sign at about the same boundary. We compare theseresults with recent theoretical models.Comment: LaTex, 4 pages, 4 figure

physical review. b, condensed matter

Novel phases in the field-induced spin-density-wave state in<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</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Novel phases in the field-induced spin-density-wave state in(TMTSF)2PF6