Signatures of Stripe Phases in Hole Doped $La_2NiO_4$

Details Signatures of Stripe Phases in Hole Doped $La_2NiO_4$ Signatures of Stripe Phases in Hole Doped $La_2NiO_4$

1998-05-13

arxiv.org/abs/cond-mat/9805161v1

Physics

Condensed Matter

Superconductivity

11 pages, 12 figures, to appear in Phys.Rev.B(July 1,1998)

Scientific paper

10.1103/PhysRevB.58.503

We study nickelate-centered and oxygen-centered stripe phases in doped La$_{2}$NiO$_{4}$ materials. We use an inhomogeneous Hartree-Fock and random-phase approximation approach including both electron-electron and electron-lattice(e-l) coupling for a layer of La$_{2}$NiO$_{4}$. We find that whether the ground state after commensurate hole doping comprises Ni-centered or O-centered charge-localized stripes depends sensitively on the e-l interaction. With increasing e-l interaction strength, a continuous transition from an O-centered stripe phase to a Ni-centered one is found. Various low- and high-energy signatures of these two kinds of stripe phases are predicted, which can clearly distinguish them. These signatures reflect the strongly correlated spin-charge-lattice features in the vicinity of Ni-centered or O-centered stripe domains. The importance of e-l interaction for recent experiments on stripe phases is discussed.

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