title: A disorder-enhanced quasi-one-dimensional superconductor.
abstract: A powerful approach to analysing quantum systems with dimensionality d>1 involves adding a weak coupling to an array of one-dimensional (1D) chains. The resultant quasi-1D (q1D) systems can exhibit long-range order at low temperature, but are heavily influenced by interactions and disorder due to their large anisotropies. Real q1D materials are therefore ideal candidates not only to provoke, test and refine theories of strongly correlated matter, but also to search for unusual emergent electronic phases. Here we report the unprecedented enhancement of a superconducting instability by disorder in single crystals of Na2-δMo6Se6, a q1D superconductor comprising MoSe chains weakly coupled by Na atoms. We argue that disorder-enhanced Coulomb pair-breaking (which usually destroys superconductivity) may be averted due to a screened long-range Coulomb repulsion intrinsic to disordered q1D materials. Our results illustrate the capability of disorder to tune and induce new correlated electron physics in low-dimensional materials.
authors.affiliation: Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore.
authors.forename: A P
authors.initials: AP
authors.lastname: Petrović
authors.affiliation: Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore.
authors.forename: D
authors.initials: D
authors.lastname: Ansermet
authors.affiliation: Swiss-Norwegian Beamlines, European Synchrotron Radiation Facility, 6 rue Jules Horowitz, F-38043 Grenoble Cedex, France.
authors.forename: D
authors.initials: D
authors.lastname: Chernyshov
authors.affiliation: Diamond Light Source, Harwell Campus, Didcot OX11 0DE, Oxfordshire, UK.
authors.forename: M
authors.initials: M
authors.lastname: Hoesch
authors.affiliation: Sciences Chimiques, CSM UMR CNRS 6226, Université de Rennes 1, Avenue du Général Leclerc, 35042 Rennes Cedex, France.|Faculty of Science III, Lebanese University, PO Box 826, Kobbeh-Tripoli, Lebanon.
authors.forename: D
authors.initials: D
authors.lastname: Salloum
authors.affiliation: Sciences Chimiques, CSM UMR CNRS 6226, Université de Rennes 1, Avenue du Général Leclerc, 35042 Rennes Cedex, France.
authors.forename: P
authors.initials: P
authors.lastname: Gougeon
authors.affiliation: Sciences Chimiques, CSM UMR CNRS 6226, Université de Rennes 1, Avenue du Général Leclerc, 35042 Rennes Cedex, France.
authors.forename: M
authors.initials: M
authors.lastname: Potel
authors.affiliation: Institute for Theoretical and Computational Physics, TU Graz, Petersgasse 16, 8010 Graz, Austria.
authors.forename: L
authors.initials: L
authors.lastname: Boeri
authors.affiliation: Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore.
authors.forename: C
authors.initials: C
authors.lastname: Panagopoulos