Superconducting transitions of intrinsic arrays of weakly coupled 1D   superconducting chains: The case of the extreme quasi-1D superconductor   Tl2Mo6Se6
  Tl2Mo6Se6 represents a model system for quasi-one-dimensional superconductors. We investigate its superconducting transition in detail by means of electrical transport experiments on high-quality single crystalline samples with onset Tc = 6.8 K. Our measurements indicate a highly complex superconducting transition which occurs in different stages, with a characteristic bump in the resistivity and distinct plateau structures in the supercurrent gap imaged by V-I curves. We interpret these features as fingerprints of the gradual establishment of global phase coherence in an array of weakly coupled parallel one-dimensional (1D) superconducting bundles. In this way, we demonstrate that superconducting Tl2Mo6Se6 behaves like an intrinsic array of Proximity or Josephson junctions, undergoing a complex superconducting phase-ordering transition at 4.5 K which shows many similarities to the Berezinskii-Kosterlitz-Thouless transition. 
B. Bergk, A. P. Petrovi\'c, Z. Wang, Y. Wang, D. Salloum, P. Gougeon,   M. Potel, and R. Lortz
cond-mat.supr-con