From charge transfer type insulator to superconductor

TL;DR

This paper introduces a microscopic model Hamiltonian to explain how impurity doping induces an insulator-to-superconductor transition and the coexistence of antiferromagnetism and superconductivity in high-Tc cuprates, highlighting a crossover from non-Fermi liquid to Fermi liquid behavior.

Contribution

It presents a new microscopic Hamiltonian model that captures impurity doping effects and the transition mechanisms in high-Tc cuprates.

Findings

Impurity doping induces insulator-superconductor transition.

Coexistence of antiferromagnetism and superconductivity explained.

Delocalization of d electrons at Cu sites marks the crossover from non-Fermi to Fermi liquid.

Abstract

We propose a microscopic model Hamiltonian to account for impurity doping induced insulator-superconductor transition and the coexistence of antiferromagnetism and superconductivity in the high-Tc cuprates. The crossover from non Fermi liquid to Fermi liquid regime characterized by delocalization of delocalization of d electrons at Cu sites is discussed.