Soliton phase near antiferromagnetic quantum critical point in Q1D conductorsL. P. Gor'kov1, 2 and P. D. Grigoriev1, 2
1 National High Magnetic Field Laboratory, Florida State University Tallahassee, FL 32306-4005, USA
2 L. D. Landau Institute for Theoretical Physics - Chernogolovka, Russia
received 6 April 2005; accepted in final form 27 May 2005
published online 29 June 2005
In frameworks of a nesting model for Q1D organic conductors at the antiferromagnetic (SDW) quantum critical point, the first-order transition separates the metallic state from the soliton phase having periodic domain structure. The low-temperature phase diagram also displays a 2nd-order transition line between the soliton and the uniformly gapped SDW phases. The results agree with the phase diagram of (TMTSF)2PF6 near critical pressure (Vuletic T. et al. , Eur. Phys. J. B 25 (2002) 319). The detection of the 2nd-order transition line is discussed. We comment on superconductivity at low temperature.
71.30.+h - Metal-insulator transitions and other electronic transitions.
74.70.Kn - Organic superconductors.
75.30.Fv - Spin-density waves.
© EDP Sciences 2005