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We report on the 29 Si nuclear spin decoherence time at room temperature for a pure (99.%, 7N) and carrier-less (p-type, doping level of 10 15 cm -3 ) silicon in which 29 Si nuclei are naturally abundant (4.7%). Despite the experimental difficulties coming from the extremely long spin-lattice relaxation time T1 (of the order of 10 4 s), we have successfully observed a series of spin-echoes of which the time dependence is characterized by the decoherence time T2. We found that the decoherence process deviates from a single Gaussian or Lorentzian function but is well-reproduced by a bi-exponential function with the shorter T2 S = 15±5 ms and the longer T2 L = 200±20 ms.

29Si Nuclear-Spin Decoherence Process Directly Observed by Multiple Spin-Echoes for Pure and Carrier-Less Silicon

²⁹Si Nuclear-Spin Decoherence Process Directly Observed by Multiple Spin-Echoes for Pure and Carrier-Less Silicon