Superconducting fluctuations--Large Diamagnetism of Low $T_c$ Nanoparticles

TL;DR

This paper demonstrates that low $T_c$ superconductor nanoparticles exhibit significant diamagnetism well above their critical temperature, primarily due to superconducting fluctuations, explaining recent experimental observations.

Contribution

It provides a theoretical explanation for large diamagnetic responses in low $T_c$ nanoparticles, extending understanding of superconducting fluctuations at high temperatures.

Findings

Nanoparticles show large diamagnetism at temperatures much higher than $T_c$.

Superconducting fluctuations account for most features of observed giant diamagnetism.

The magnitude of the diamagnetic response exceeds previous expectations.

Abstract

It is shown that nanoparticles made of low $T_c$ superconductors have large diamagnetic response at temperatures several orders of magnitude above $T_c$. Most features of the recently observed Giant diamagnetism of Au nanorods are explained in terms of superconducting fluctuations, except for the huge magnitude of the effect.