Introduction to Highly Conducting One-Dimensional Solids

In the past several years a number of materials, such as K2Pt(CN)4X0.3·xH2O, X = Cl, Br (KCP), the tetracyanoquinodimethane (TCNQ) salts, and the sulfur-nitrogen polymer [(SN)x], have been discovered whose microscopic structure consists, to a greater or lesser extent, of a collection of weakly coupled, highly conducting chains. Such materials are called quasi-one-dimensional metals and they are of interest because nearly one-dimensional metals …