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A disorder-enhanced quasi-one-dimensional superconductor | | A.P. Petrović
; D. Ansermet
; D. Chernyshov
; M. Hoesch
; D. Salloum
; P. Gougeon
; M. Potel
; L. Boeri
; C. Panagopoulos
; | | Date: |
21 Mar 2016 | | 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-one-dimensional (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 Na$_{2-delta}$Mo$_6$Se$_6$, 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.
This scenario is supported by the normal-state electrical resistivity of
Na$_{2-delta}$Mo$_6$Se$_6$, which is compatible with theories for disordered
1D systems with attractive electron-electron interactions. However, several
features in our data cannot be described by existing models, including an
emergent mobility edge and a frequency-dependent conductivity at low
temperature. Our results illustrate the capability of disorder to tune and
induce new correlated electron physics in low-dimensional materials. | | Source: | arXiv, 1603.6497 | | Services: | Forum | Review | PDF | Favorites | |
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