A Universal MO-VB Approach to Electron and Spin Correlations in Copper-Oxide Clusters: Néel Order, Spin Fluctuation and High-T_c Superconductivity

1 March 1988

journal article
Published by IOP Publishing in Japanese Journal of Applied Physics

Vol. 27 (3A), L393
https://doi.org/10.1143/jjap.27.l393

Abstract

The Hubbard model for the Cu₄O₄ cluster was solved analytically in order to clarify the interrelationships between molecular orbital (MO)- and valence-bond (VB)-type solutions. Both VB and MO models were complementarily applied to investigations of Néel order, spin fluctuation and magnetic excitations for copper oxides belonging to the intermediate correlation regime. Our previous J-model (Jpn. J. Appl. Phys. 26 (1987) L1362) for high-T _c superconductivity seems compatible with the spin fluctuations observed recently.

Keywords

This publication has 12 references indexed in Scilit:

Neutron-Diffraction Determination of Antiferromagnetic Structure of Cu Ions in $Y {Ba}_{2} {Cu}_{3} O_{6 + x}$ with $x = 0.0 and 0.15$
Physical Review Letters, 1988
Ab initio MO Studies on the Correlation and Spin Correlation Effects for Copper-Oxygen and Copper-Halogen Bonds in High-T_c Copper Oxide Superconductors
Japanese Journal of Applied Physics, 1987
Two-dimensional antiferromagnetic quantum spin-fluid state in ${La}_{2}$ ${CuO}_{4}$
Physical Review Letters, 1987
Antiferromagnetism of ${La}_{2}$ ${CuO}_{4 - y}$ studied by muon-spin rotation
Physical Review Letters, 1987
Ab Initio MO Calculations of Effective Exchange Integrals between Transition-Metal Ions via Oxygen Dianions: Nature of the Copper-Oxygen Bonds and Superconductivity
Japanese Journal of Applied Physics, 1987
Antiferromagnetism in ${La}_{2}$ ${CuO}_{4 - y}$
Physical Review Letters, 1987
A generalized MO (GMO) approach to unstable molecules with quasi-degenerate electronic states: ab initio GMO calculations of intramolecular effective exchange integrals and designing of organic magnetic polymers
Synthetic Metals, 1987
The Resonating Valence Bond State in La ₂ CuO ₄ and Superconductivity
Science, 1987
The electronic structures of biradicals in the unrestricted Hartree-Fock approximation
Chemical Physics Letters, 1975
Possibility of a Phase Transition for the Two-Dimensional Heisenberg Model
Physical Review Letters, 1966

Cited by 9 articles

A Universal MO-VB Approach to Electron and Spin Correlations in Copper-Oxide Clusters: Néel Order, Spin Fluctuation and High-Tc Superconductivity

Abstract

Keywords

A Universal MO-VB Approach to Electron and Spin Correlations in Copper-Oxide Clusters: Néel Order, Spin Fluctuation and High-T_c Superconductivity