1. Superconductivity : history and motivations -- 2. Introduction and theory -- 3. Experimental methods -- 4 The quasi-one-dimensional Na2 -- 5. The electronic normal state in Na2 -- 6. Superconducting transition and pairing enhancement by disorder -- 7. Reentrant phase coherence by Josephson coupling -- 8. Summary and outlook.
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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-?Mo6Se6, composed of MoSe filaments weakly coupled by Na atoms and subject to intrinsic disorder (?> 0). It shows that the Na2-?Mo6Se6 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-?Mo6Se6 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.