Key issues in theories of high temperature superconductors

TL;DR

This paper discusses the challenges in understanding high temperature superconductivity, analyzing recent magnetic oscillation experiments and their implications for Fermi liquid theory and the broader physics of unconventional superconductors.

Contribution

It critically examines the applicability of Fermi liquid theory to recent experimental results in high temperature superconductors, prompting a re-evaluation of existing paradigms.

Findings

Magnetic oscillation experiments can be explained by Fermi liquid theory

The validity of Fermi liquid theory in these materials is uncertain

Broader analysis of ground states of matter is necessary

Abstract

High temperature superconductivity in cuprate superconductors remains an unsolved problem in theoretical physics. The same statement can also be made about a number of other superconductors that have been dubbed unconventional. What makes these superconductors so elusive is an interesting question in itself. The present manuscript focuses on the recent magnetic oscillation experiments and how they fit into the broader picture. Many aspects of these experiments can be explained by Fermi liquid theory; the key issue is the extent to which this is true. If true, the entire paradigm developed over the past three decades must be reexamined. A critical analysis of this issue has necessitated a broader analysis of questions about distinct ground states of matter, which may be useful in understanding other unconventional superconductors.