J. Phys. IV France
Volume 12, Numéro 9, November 2002
Page(s) 61 - 64

J. Phys. IV France
12 (2002) Pr9-61
DOI: 10.1051/jp4:20020355

Spin density wave - metal (superconductor) competition: A phase segregation scenario

C. Pasquier, M. Héritier and D. Jérome

Laboratoire de Physique des Solides, bâtiment 510, Centre Universitaire, 91405 Orsay cedex, France

We present a model comparing the free energy of a phase exhibiting a segregation between spin density wave (SDW) and metallic domains (eventually superconducting domains) and the free energy of homogeneous phases which explains the findings observed recently in (TMTSF) 2PF 6. The dispersion relation of this quasi-one-dimensional organic conductor is linearized around the Fermi level. Deviations from perfect nesting which stabilizes the SDW state are described by a unique parameter t 'b, this parameter can be the pressure as well.

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