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Author (up) Núñez Regueiro, M.; Mignot, J.M.; Jaime, M.; Castello, D.; Monceau, P. url  doi
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  Title Superconductivity under pressure in linear chalcogenides Type Journal Article
  Year 1993 Publication Synthetic Metals Abbreviated Journal Synth. Met.  
  Volume 56 Issue 2-3 Pages 2653-2659  
  Keywords  
  Abstract We have measured the electrical resistivity of several quasi 1-D chalcogenides between 1.2 and 300K and from ambient pressure up to 25GPa. On NbSe3 we find that the high temperature charge density wave (CDW) transition T1 disappears at a pressure of about 3.5GPa, where the superconducting transition temperature Tc jumps to not, vert, similar5K. The similar pressure dependence of the logarithmic pressure derivative of both T1 and Tc above this pressure suggests the existence of independent superconducting states. On m-TaS3 we observe a maximum on the T1-P variation at not, vert, similar3.5GPa, that we attribute to a CDW transition temperature strongly diminished by 1-D fluctuations that are reduced at low applied pressures, with T2 behaving in a monotonous decreasing way with pressure. While on o-TaS3 the CDW that develops at 210K at ambient pressure, gives way to a superconducting state of Tcnot, vert, similar3K at a pressure of 6.5GPa. The behaviour of (TaSe4)2I is scaled to the precedent, with a higher critical pressure of 15GPa that induces the appearance of a superconducting state with Tc=2.5K.  
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  ISSN 0379-6779 ISBN Medium  
  Area Expedition Conference International Conference on Science and Technology of Synthetic Metals  
  Notes Approved no  
  Call Number BT @ pedrazp @ Serial 579  
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