Superconducting transitions of intrinsic arrays of weakly coupled one-dimensional superconducting chains: the case of the extreme quasi-1D superconductor Tl(2)Mo(6)Se(6)

B. Bergk (1) , A.P. Petrovic (2) , Z. Wang (1) , Y. Wang (1) , D. Salloum (3) , Patrick Gougeon (3) , Michel Potel (3) , R. Lortz (1)

1 Department of Physics [Hong Kong University of Science and Technology]
2 Nanyang Technological University [Singapour]
3 ISCR - Institut des Sciences Chimiques de Rennes

Tl(2)Mo(6)Se(6) represents a model system for quasi-one-dimensional (quasi-1D) superconductors. We investigate its superconducting transition in detail by means of electrical transport experiments on high-quality single crystalline samples with onset T(c) = 6.8 K. Our measurements indicate a highly complex superconducting transition that 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 1D superconducting bundles. In this way, we demonstrate that superconducting Tl(2)Mo(6)Se(6) behaves like an intrinsic array of proximity or Josephson junctions, undergoing a complex superconducting phase-ordering transition at 4.5 K that shows many similarities to the Berezinskii-Kosterlitz-Thouless transition.

Mots clés: Superconductivity

Domaines: Matériaux

B. Bergk, A.P. Petrovic, Z. Wang, Y. Wang, D. Salloum, et al.. Superconducting transitions of intrinsic arrays of weakly coupled one-dimensional superconducting chains: the case of the extreme quasi-1D superconductor Tl(2)Mo(6)Se(6). New Journal of Physics, 2011, 13, pp.103018. ⟨10.1088/1367-2630/13/10/103018⟩. ⟨hal-00825582⟩