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Paramagnon Effect on the Nuclear Spin-Lattice Relaxation in Type-I Superconductors

The paramagnon effect on the nuclear spin-lattice relaxation rate ( R =1/ T 1 ) is discussed by using the electron gas model for paramagnons combined with the Debye phonon model within the framework of the strong-coupljng approximation. It is shown that the maximum value of the ratio R S ( T )/ R N (S and N stand for the superconducting and the normal states, respectively) is suppressed by the paramagnon contribution which increases the life-time broadening of the quasi-particles.