Specific heat measurements of organic superconductivity in (TMTSF) 2ClO4
Résumé
The specific heat of the organic superconductor (TMTSF)2ClO 4 has been measured between 0.4 and 2 K. A large anomaly of the electronic contribution at 1.22 K has been attributed to the onset of three-dimensional superconducting order. There is a large magnetic field dependence of the electronic contribution above 1.22 K which is not characteristic of a normal conducting state. The application of a magnetic field of 63 kOe along the c*-axis of the single crystals restores a ground state exhibiting a very low density of states at the Fermi level (a narrow gap semiconducting or a semimetallic state). A phase transition towards a conducting state with a finite density of states at Fermi level is visible around 1.4 K. Our specific heat results support the existence of a wide 1-D superconducting fluctuating regime.
Mots clés
fluctuations in superconductors
organic compounds
specific heat of solids
type II superconductors
0.4 to 2K
organic superconductivity
TMTSF sub 2 ClO sub 4
specific heat
electronic contribution
three dimensional superconducting order
magnetic field dependence
ground state
very low density of states
Fermi level
phase transition
conducting state
superconducting fluctuating regime
Domaines
Articles anciens
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