Transport anomalies and quantum criticality in electron-doped cuprate superconductors

TL;DR

This review summarizes transport phenomena in electron-doped cuprate superconductors, highlighting intriguing anomalies and quantum criticality that challenge existing theories and suggest a unified understanding of their complex behavior.

Contribution

It provides a comprehensive overview of transport anomalies and quantum critical phenomena in electron-doped cuprates, proposing a unified framework for their complex behaviors.

Findings

Identification of common features like strange metal behavior and negative magnetoresistance

Observation of multiple sign reversals of Hall effect in mixed state

Detection of abnormal Nernst signals and complex quantum criticality

Abstract

Superconductivity research is like running a marathon. Three decades after the discovery of high-Tc cuprates, there have been mass data generated from transport measurements, which bring fruitful information. In this review, we give a brief summary of the intriguing phenomena reported in electron-doped cuprates from the aspect of electrical transport as well as the complementary thermal transport. We attempt to sort out common features of the electron-doped family, e.g. the strange metal, negative magnetoresistance, multiple sign reversals of Hall in mixed state, abnormal Nernst signal, complex quantum criticality. Most of them have been challenging the existing theories, nevertheless, a unified diagram certainly helps to approach the nature of electron-doped cuprates.