Superconducting state of the organic conductor (TMTSF)2ClO4 |
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Authors: | Shinagawa J Kurosaki Y Zhang F Parker C Brown S E Jérome D Christensen J B Bechgaard K |
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Affiliation: | Department of Physics Astronomy, UCLA, Los Angeles, California 90095, USA. |
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Abstract: | (TMTSF)2ClO4 is a quasi-one-dimensional organic conductor and superconductor with Tc=1.4 K, and one of at least two Bechgaard salts observed to have upper critical fields far exceeding the paramagnetic limit. Nevertheless, the 77Se NMR Knight shift at low fields reveals a decrease in spin susceptibility chi(s) consistent with singlet spin pairing. The field dependence of the spin-lattice relaxation rate at 100 mK exhibits a sharp crossover (or phase transition) at a field Hs approximately 15 kOe, to a regime where chi(s) is close to the normal state value, even though Hc2> Hs. |
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