Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-04-25
Phys. Rev. B 76, 165114 (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
12 pages, 10 figures, fully revised
Scientific paper
10.1103/PhysRevB.76.165114
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.
Fujiwara Takanori
Hatsugai Yasuhiro
Yamamoto Shoji
No associations
LandOfFree
Charge and spin stripe in La$_{2-x}$Sr$_{x}$NiO$_{4}$ (x=1/3,1/2) does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Charge and spin stripe in La$_{2-x}$Sr$_{x}$NiO$_{4}$ (x=1/3,1/2), we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Charge and spin stripe in La$_{2-x}$Sr$_{x}$NiO$_{4}$ (x=1/3,1/2) will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-707217