Landau theory of stripe phases in cuprates and nickelates

Article

关键词: 2-DIMENSIONAL HUBBARD-MODEL;    MONTE-CARLO;    HEISENBERG-ANTIFERROMAGNET;    DOPED ANTIFERROMAGNET;    LONG-RANGE;    CHARGE;    HOLES;    SPINS;    SUPERCONDUCTIVITY;    FLUCTUATIONS;   

DOI  :  10.1103/PhysRevB.57.1422

来源: SCIE

【 摘 要 】

We consider a Landau theory of coupled charge and spin-density-wave order parameters as a simple model for the ordering that has been observed experimentally in the La2NiO4 and La2CuO4 families of doped antiferromagnets. The period or the charge-density wave is generically half that of the spin-density wave. or equivalently the charges form antiphase domain walls in the antiferromagnetic order. A sharp distinction exists between the case in which the ordering is primarily charge driven (which produces a sequence of transitions in qualitative agreement with experiment) or spin driven (which does not). We also find that stripes with non-collinear spin order (i.e., spiral phases) are possible in a region of the phase diagram a here the transition is spin driven; the spiral is circular only when there is no charge order, and is otherwise elliptical with an eccentricity proportional to the magnitude of the charge order.

【 授权许可】

Free