Nuclear Quadrupole Spin-Lattice Relaxation of Ta^<181> in Type II Superconduction Ta_3Sn

概要

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Following the discovery of the NMR signal of Ta^<181> in Ta_3Sn, the Ta^<181> and Sn^<119> nuclear spin-lattice relaxation rates have been studied in its superconducting mixed state. The relaxation rate of Sn^<119> shows a clear dip just below T_c(H) which typifies the magnetic relaxation rate, where T_c(H) is the transition temperature corresponding to the external magnetic field, H. In contrast, the relaxation rate of Ta^<181> drops rapidly just below T_c(H) and then decreases monotonically with decreasing temperature. It is shown that this relaxation behavior is attributed predominantly to the quadrupole relaxation mechanism. In order to obtain a good agreement between the experimental data and the theoretically calculated value of BCS Case I, one is led to estimate the quadrupole relaxation rate to be three times as large as the magnetic relaxation rate in Ta^<181> relaxation.
社団法人日本物理学会の論文
1973-05-05