https://doi.org/10.1140/epjb/e2006-00193-x
Triplet superconductivity in a 1D itinerant electron system with transverse spin anisotropy
1
Institut für Theoretische Physik, Universität zu Köln, 50937 Köln, Germany
2
Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Str. 38, 01187 Dresden, Germany
3
Institut für Theorie der Kondensierten Materie Universität Karlsruhe, 76128 Karlsruhe, Germany
Corresponding author: a as@thp.uni-koeln.de
Received:
31
October
2005
Revised:
24
February
2006
Published online:
31
May
2006
In this paper we study the ground state phase diagram of a one-dimensional t-J-U model away from half-filling. In the large-bandwidth limit and for ferromagnetic exchange with easy-plane anisotropy a phase with gapless charge and massive spin excitations, characterized by the coexistence of triplet superconducting and spin density wave instabilities is realized in the ground state. With increasing ferromagnetic exchange transitions into a ferrometallic and then a spin gapped triplet superconducting phase take place.
PACS: 71.10.Hf – Non-Fermi-liquid ground states, electron phase diagrams and phase transitions in model systems / 71.10.Fd – Lattice fermion models (Hubbard model, etc.) / 74.20.Mn – Unconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.) / 71.27.+a – Strongly correlated electron systems; heavy fermions
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2006
