Abstract
The NMR shift, line shape and spin-lattice relaxation time of superconducting small particles of Sn were measured at temperatures between 1.3 and 4.2 K and in magnetic fields between 5.6 and 30 kOe. The mean size ranged from 70 to 450 A in diameter. The critical field of the particles proved to be in agreement with the theory. In low fields, the fluctuation theory, which takes into account the effect of spin-orbit interaction, well reproduces the experimental results for large particles. The consideration of level quantization effect in addition to the fluctuation theory allows qualitative understanding of the results for smaller particles.
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