Emergent Superconductivity in Low Dimensions

Description

This book explores the relationship between electronic correlations, dimensionality, inhomogeneities, and superconductivity in low-dimensional systems by studying single crystals of the quasi-one-dimensional Na2–δMo6Se6, composed of MoSe filaments weakly coupled by Na atoms and subject to intrinsic disorder (δ > 0). It shows that the Na2-δMo6Se6 displays strong electronic correlations in its normal state, whereas a superconducting ground state emerges from Anderson localized electrons. Two novel behaviors of the superconducting state are observed: first, a disorder induced enhancement of the superconducting transition temperature; second, a reentrant phase coherence with increasing temperature, magnetic field, and current. It also analyzes the intrinsic properties of Na2-δMo6Se6 are analyzed to offer a thorough understanding of these phenomena. The emergence of superconductivity in such low-dimensional systems provides a fruitful playground to explore electronic order and correlations. Front Matter ....Pages i-xxxix Superconductivity: History and Motivations (Diane Ansermet)....Pages 1-4 Introduction and Theory (Diane Ansermet)....Pages 5-32 Experimental Methods (Diane Ansermet)....Pages 33-71 The Quasi-One-Dimensional \(\mathrm{Na}_{2-\delta }\mathrm{Mo}_{6}\mathrm{Se}_{6}\) (Diane Ansermet)....Pages 73-89 The Electronic Normal State in \(\mathrm{Na}_{2-\delta }\mathrm{Mo}_{6}\mathrm{Se}_6\) (Diane Ansermet)....Pages 91-111 Superconducting Transition and Pairing Enhancement by Disorder (Diane Ansermet)....Pages 113-133 Reentrant Phase Coherence by Josephson Coupling (Diane Ansermet)....Pages 135-159 Summary and Outlook (Diane Ansermet)....Pages 161-165