Proton Spin Relaxation in the Superconducting State of (TMTSF)₂ClO₄

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The proton spin lattice relaxation rate (1⁄T₁) in the superconducting state of (TMTSF)₂ClO₄ has been measured at zero magnetic field using the field cycling technique. It was found that the enhancement of 1⁄T₁ just below T_c, commonly observed in typical BCS superconductors, was absent and 1⁄T₁ varied as T³. These results indicate that the superconductivity in this system is associated with the anisotropic order parameter vanishing along lines on the Fermi surface.