Nuclear Magnetic Resonance in α- and β- Manganese Metals

概要

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Nuclear magnetic resonance studies on Mn^<55> in α- and β-Mn metals have been made by both the steady and the pulse methods. Nuclear spin-lattice relaxation time T_1 and spin-spin relaxation time T_2 were measured by the pulse method in the temperature range of 1.5°K to 77°K. The measured value of T_1T of β-Mn keeps a constant value of 7 m sec °K through the temperature range measured. Using both the T_1T value and the Knight shift, the origin of the effective magnetic fieid acting on a nucleus in a Mn metal was concerned. T_2 of 0.1 m sec. was observed to be temperature independent. Several nuclear spin-lattice relaxation mechanisms together with the origin of the effetive magnetic field in the Mn metal are discussed. T_1 due to the dipole, quadrupole, and orbital interactions is calculated using free electron approximation in which the electronic wave function includes partly p-or d-character. It is shown that the orbital interaction is more effective than those due to the dipole or quadrupole interaction. Mn^<55> nuclear magnetic resonance in an antiferromagnetic α-Mn metal was observed by the pulse method in zero external magnetic field and at temperatures of 1.5°K to 4.2°K.
社団法人日本物理学会の論文
1964-04-05