Triplet superconductivity in a one-dimensional ferromagnetic t-J model

Article

关键词: RENORMALIZATION-GROUP;    PHASE-TRANSITIONS;    HUBBARD-MODEL;    COULOMB GAS;    XY-MODEL;    SR2RUO4;    STATE;    NMR;    RELAXATION;    SYMMETRY;   

DOI  :  10.1103/PhysRevB.61.9019

来源: SCIE

【 摘 要 】

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. In the case of weakly anisotropic antiferromagnetic exchange the system shows a long-range dimerized (Peierls) ordering in the ground state. The complete weak-coupling phase diagram of the model, including effects of the on-site Hubbard interaction, is obtained.

【 授权许可】

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