Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-02-16
Eur. Phys. J. B 37, 453-463 (2004)
Physics
Condensed Matter
Strongly Correlated Electrons
11 pages with 15 figures
Scientific paper
10.1140/epjb/e2004-00081-5
In this paper we study the ground state phase diagram of a one-dimensional $t-U-J$ 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-1/2 XY model takes place.
Dziurzik C.
Japaridze George I.
Schadschneider Andreas
Zittartz Johannes
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