Universal linear relations between susceptibility and Tc in cuprates

TL;DR

This paper introduces a new experimental method to measure the intrinsic susceptibility of cuprate superconductors and discovers a universal linear relation between the critical temperature and susceptibility across different cuprate families.

Contribution

The authors developed a novel measurement technique for intrinsic susceptibility and identified a universal linear relation with Tc in cuprates, providing new insights into their superconducting properties.

Findings

Universal linear relation between Tc and susceptibility in cuprates

Validated the measurement method with lead spheres

Observed consistent behavior across multiple cuprate families

Abstract

We developed an experimental method for measuring the intrinsic susceptibility \chi of powder of cuprate superconductors in the zero field limit using a DC-magnetometer. The method is tested with lead spheres. Using this method we determine \chi for a number of cuprate families as a function of doping. A universal linear (and not proportionality) relation between Tc and \chi is found. We suggest possible explanations for this phenomenon.