Interchain interactions and magnetic properties of Li2CuO2

TL;DR

This paper develops an effective Hamiltonian for Li2CuO2, revealing the role of interchain interactions in its magnetic properties, and compares theoretical spectra with experimental neutron scattering data.

Contribution

It introduces a Hamiltonian including interchain interactions for Li2CuO2 and analyzes its magnetic excitation spectra using exact diagonalization.

Findings

Magnetic susceptibility analysis indicates coupled frustrated chains.

Calculated spin correlation spectra match neutron scattering results.

Interchain interactions significantly influence magnetic excitations.

Abstract

An effective Hamiltonian is constructed for an insulating cuprate with edge-sharing chains Li2CuO2.The Hamiltonian contains the nearest and next-nearest neighboring intrachain and zigzag-type interchain interactions.The values of the interactions are obtained from the analysis of the magnetic susceptibility, and this system is found to be described as coupled frustrated chains.We calculate the dynamical spin correlation function S(q,\omega) by using the exact diagonalization method, and show that the spectra of S(q,\omega) are characterized by the zigzag-type interchain interactions. The results of the recent inelastic neutron scattering experiment are discussed in the light of the calculated spectra.