Strongly Correlated Electrons and Neutron Scattering

TL;DR

This paper explores the relationship between antiferromagnetism and singlet ground states in quantum materials, highlighting neutron scattering's role in revealing disorder-induced magnetism and charge ordering phenomena.

Contribution

It emphasizes the importance of neutron scattering in studying quantum magnetic states and discusses disorder-induced antiferromagnetism and charge ordering in specific materials.

Findings

Disorder-induced antiferromagnetism observed in spin-Peierls systems.

Similar magnetic features found in Ce_xCu_2Si_2 and high T_c cuprates.

Charge ordering in NaV_2O_5 quenches localized spins.

Abstract

Various aspects of close and interesting relationship between antiferromagnetism and singlet ground states are introduced for which neutron scattering have been playing vital roles. The special emphasis is on the disorder-induced antiferromagnetism in spin-Peierls systems, which can be viewed as a nucleation process of classical magnetic order in the background of singlet state whose origin is purely quantum-mechanical. It is then pointed out that similar features will be found in Ce_xCu_2Si_2 and high T_c cuprates. Finally the possible charge ordering process in NaV_2O_5 is discussed which leads to the quenching of localized spins.