Superconducting state of the organic conductor (TMTSF)2ClO4.
(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.
Shinagawa
J
J
Department of Physics Astronomy, UCLA, Los Angeles, California 90095, USA.
Kurosaki
Y
Y
Zhang
F
F
Parker
C
C
Brown
S E
SE
Jérome
D
D
Christensen
J B
JB
Bechgaard
K
K