Metal-insulator transitions are accompanied by huge resistivity changes, even over tens of
orders of magnitude, and are widely observed in condensed-matter systems. This article …

In materials with strong local Coulomb interactions, simple defects such as atomic
substitutions strongly affect both macroscopic and local properties of the system. A …

To make the transition from the quasi-long-range order in a chain of antiferromagnetically
coupled S= 1/2 spins to the true long-range order that occurs in a plane, one can assemble …

This is a revised version of the first edition published in 1991. At the same time, this is a
revised version of the Syokabo edition, which was written in Japanese and published in …

Abstract Magnetic properties of Sr Cu 2 O 3 and Sr 2 Cu 3 O 5, containing two-leg and three-
leg S= 1 2 ladders made of antiferromagnetic Cu-O-Cu linear bonds, were investigated. The …

In recent years, the study of ladder materials has developed into a well-established area of
research within the general context of strongly correlated electrons. This effort has been …

We investigate the magnetic properties of the Cu-O planes in stoichiometric Sr n− 1 Cu n+ 1
O 2 n (n= 3, 5, 7,...) which consist of CuO double chains periodically intergrown within the …

A survey of recent experimental results is given, presenting the growth of oxide epitaxial thin
films in P− T− x conditions, which are far from those necessary for the existence of …

An overview of one-and two-dimensional quantum spin systems based on transition-metal
oxides and halides of current interest is given, such as spin-Peierls, spin-dimer …

Neutron diffraction and bulk measurements are used to determine the nature of the low-
temperature ordered state in LiCu 2 O 2, a S= 1/2 spin-chain compound with competing …