Abstract
Nuclear magnetic resonance measurements have been performed for189Pt and191Pt oriented at 7 and 15 mk in iron host. The magnetic hyperfine splitting frequencies, ν=¦μBHF/Ih¦, of the189Pt and191Pt ground states were determined to be 277.61(5) and 319.88(3) MHz. With the hyperfine field of BHF=-1280(26) kG the nuclear magnetic moments were deduced to be: ¦μ(189Pt;3/2−)¦=0.427(9) μN; ¦μ(191Pt,3/2−) ¦=0.492(10) μN. The effective spinlattice relaxation time for191PtFe at 7 mK in a polarizing magnetic field of 2 kG has been found to be 30(2) s using a single-exponential fit.
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