Charge and spin stripe in La$_{2-x}$Sr$_{x}$NiO$_{4}$ (x=1/3,1/2)

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dc.creatorYamamoto, S.
dc.creatorFujiwara, T.
dc.creatorHatsugai, Y.
dc.date2007-04-25
dc.date2007-09-03
dc.date.accessioned2026-07-07T08:47:19Z
dc.date.available2026-07-07T08:47:19Z
dc.descriptionElectronic 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.
dc.description12 pages, 10 figures, fully revised
dc.identifierhttps://arxiv.org/abs/0704.3323
dc.identifierhttp://arxiv.org/abs/0704.3323
dc.identifierPhys. Rev. B 76, 165114 (2007)
dc.identifierdoi:10.1103/PhysRevB.76.165114
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/143556
dc.subjectStrongly Correlated Electrons
dc.titleCharge and spin stripe in La$_{2-x}$Sr$_{x}$NiO$_{4}$ (x=1/3,1/2)
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