Charge and spin stripe in La${}_{2-x}$Sr${}_x$NiO${}_4$ (x=1/3,1/2)

Abstract

Electronic structure of stripe ordered La${}_{2-x}$Sr${}_x$NiO${}_4$ is investigated. The system with x=1/3 is insulator, in LSDA+U calculations, and shows charge and spin stripe, consistent with the experimental results. Highly correlated system of x=1/2 is studied by using exact diagonalization of multi-orbital many body Hamiltonian derived from LDA calculations and including on-site and inter-site Coulomb interactions. The fluctuation of the residual spin on Ni${}^{3+}$ (hole) site couples with the charge fluctuation between Ni${}^{3+}$ and Ni${}^{2+}$ states and this correlation lowers the total energy. The resultant ground state is insulator with charge and spin stripe of the energy gap 0.9eV, consistent with observed one. The on-site Coulomb interaction stabilizes integral valency of each Ni ion (Ni${}^{3+}$ and Ni${}^{2+}$), but does not induce the charge order. Two quantities, inter-site Coulomb interaction and anisotropy of hopping integrals, play an important role to form the charge and spin stripe order in a system of x=1/2.

arXiv comment12 pages, 10 figures, fully revised

References in corpus (6)

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