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Critical nuclear relaxation in cobalt metal
Authors:M. Shaham  J. Barak  U. El-Hanany  W.W. Warren
Affiliation:Soreq Nuclear Research Center Yavne, Israel;Bell Laboratories Murray Hill, New Jersey 07974 U.S.A.
Abstract:Nuclear magnetic resonance of cobalt metal was investigated in the paramagnetic and ferromagnetic states and in the critical region below Tc. The Knight shift and spin lattice relaxation times were measured in the paramagnetic phase in the solid and liquid states from 1578 K to 1825 K. The resonant frequency, spin-lattice and spin-spin relaxation times were measured in the ferromagnetic phase from room temperature to 1385 K. The main part of (T1T)-1 results from fluctuating orbital moments in both phases except near Tc where this process forms the background for critical spin relaxation. The critical exponents for T-11 and for the magnetization in the ferromagnetic state were found to be n' = 0.96 ± 0.07 and β = 0.308 ± 0.012, respectively.
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