https://doi.org/10.1140/epjb/e2004-00081-5
Triplet superconductivity vs. easy-plane ferromagnetism in a 1D itinerant electron system with transverse spin anisotropy
Institut für Theoretische Physik, Universität zu Köln,
50937 Köln, Germany
Corresponding author: a as@thp.uni-koeln.de
Received:
10
December
2003
Revised:
6
February
2004
Published online:
9
April
2004
In this paper we study the ground state phase diagram of a
one-dimensional 
model, at 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 reduction
of the bandwidth, a transition into an insulating phase showing properties
of the spin-
XY model takes 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 – Nonconventional 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 / 75.10.Pq – Spin chain models
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2004
