Normal state diamagnetism of charged bosons in cuprate superconductors

TL;DR

This paper demonstrates that the normal state diamagnetism in cuprate superconductors can be explained by charged bosons undergoing 3D Bose-Einstein condensation at Tc, challenging phase fluctuation models.

Contribution

It provides a parameter-free model linking normal state diamagnetism to Bose-Einstein condensation of preformed pairs in cuprates, supporting a bosonic mechanism for superconductivity.

Findings

Normal state diamagnetism explained by charged bosons

Supports 3D Bose-Einstein condensation at Tc

Contradicts phase fluctuation scenarios

Abstract

Normal state orbital diamagnetism of charged bosons quantitatively accounts for recent high-resolution magnetometery results near and above the resistive critical temperature Tc of superconducting cuprates. Our parameter-free descriptions of normal state diamagnetism, Tc, upper critical fields and specific heat anomalies unambiguously support the 3D Bose-Einstein condensation at Tc of preformed real-space pairs with zero off-diagonal order parameter above Tc, at variance with phase fluctuation (or vortex) scenarios of the "normal" state of cuprates.