Emergent superconductivity in low dimensions
Date of Issue2018-02-06
School of Physical and Mathematical Sciences
Low-dimensional systems provide the opportunity to explore the relationship between electronic correlations, dimensionality, inhomogeneities, and superconductivity. In this work, single crystals of the quasi-one-dimensional Na2_0Mo6Se6 are studied, composed of MoSe filaments weakly coupled by Na atoms and subject to intrinsic disorder (6 > 0). Naz_0Mo6Se6 is demonstrated to display 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 disorderinduced enhancement of the superconducting transition temperature; second, a reentrant phase coherence with increasing temperature, magnetic field , and current. The intrinsic properties of Na2_0Mo6Se6 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.