Anomalous charge transport of the parent antiferromagnet Bi2Sr2RCu2O8

TL;DR

This study investigates the charge transport properties of parent antiferromagnetic insulators in Bi2Sr2Ca{1-x}RxCu2O8, revealing that their conduction behavior shares key features with high-temperature superconductors, indicating fundamental anomalies originate in the parent insulators.

Contribution

It provides detailed measurements and analysis of resistivity and thermopower in parent antiferromagnetic insulators, highlighting their similarities to high-Tc cuprates and suggesting intrinsic anomalies.

Findings

Parent insulators exhibit in-plane conduction above room temperature.

Thermopower decreases with temperature, similar to high-Tc cuprates.

Anomalies in high-Tc superconductors originate from parent insulators.

Abstract

The resistivity and the thermopower for Bi2Sr2Ca{1-x}RxCu2O8 single crystals are measured and analyzed with a special interest in the parent antiferromagnet insulators. Above room temperature, the parent insulators show an electric conduction confined in the CuO2 plane and a decreasing thermopower with temperature, which are very similar to those for high-$T_c$ cuprates. These data strongly suggest that essential anomalies of high-Tc cuprates inheres in the parent insulators.