The Challenge of Unconventional Superconductivity

TL;DR

This paper discusses the emergence of unconventional superconductors, emphasizing the difficulty in developing a comprehensive theory for their distinct mechanisms compared to traditional superconductors.

Contribution

It highlights the challenge of formulating a rigorous theoretical framework for unconventional superconductivity, which differs fundamentally from electron-ion interaction-based models.

Findings

New classes of superconductors have been discovered in recent decades.

Unconventional superconductors likely have different origins than traditional ones.

Developing a theory for these materials remains a major ongoing challenge.

Abstract

During the past few decades, several new classes of superconductors have been discovered. Most of these do not appear to be related to traditional superconductors. As a consequence, it is felt by many that for these materials, superconductivity arises from a different source than the electron-ion interactions that are at the heart of conventional superconductivity. Developing a rigorous theory for any of these classes of materials has proven to be a difficult challenge, and will continue to be one of the major problems in physics in the decades to come.