NUCLEAR SPIN-LATTICE RELAXATION IN METALS
The nuclear spin-lattice relaxation time, T/sub 1/, was measured in the range of 1.1 to 4.2 deg K for the metals lithium, sodium, aluminum, and copper. A combination of nuclear magnetic resonance at fixed frequency and adiabatic variation of the magnetic field was used to measure T/sub 1/ as a function of field between zero and one thousand gauss. At fields of between one hundred and one thousand gauss T/sub 1/ is independent of magnetic field and inversely proportional to temperature in agreement with theory. The experimental values of the relaxation time multiplied by absolute temperature in sec deg K are 44 plus or minus 2.0 for Li/sup 7/; 5.1 plus or minus 0.3 for Na/sup 23/; 1.80 plus or minus 0.05 for Al/sup 2 1.27 plus or minus 0.07 for Cu/sup 63/. These values are in good agreement with previous experimental data at room temperature and above. At fields comparable with the nuclear magnetic dipole-dipole fields, T/sup 1/ is a function of applied field. The theory of relaxation in low fields is presented in an elementary form. Qualitative agreement with theory is obtained for Al/sup 27/ and Cu/sup 63/; detailed agreement is obtained for Li/sup 7/ and Na/sup 23/. (auth)
- Research Organization:
- Columbia Univ., New York
- NSA Number:
- NSA-14-006979
- OSTI ID:
- 4178656
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Vol. Vol: 116; Other Information: Orig. Receipt Date: 31-DEC-60
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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