MEASUREMENT OF LOCAL-MOMENT-INDUCED ELECTRIC-FIELD GRADIENT AT DILUTE GOLD IMPURITIES IN IRON BY SINGLE-PASSAGE NMR ON ORIENTED NUCLEI
The effect of small quadrupole interactions on single-passage nuclear magnetic resonance of oriented nuclei is reported both in theory and experiment. In contrast to the purely magnetic (Zeeman) case, the quadrupole interaction P gives rise to a sweep-direction dependence of the resonance signal. Th...
| Main Authors: | , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
1975
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| Summary: | The effect of small quadrupole interactions on single-passage nuclear magnetic resonance of oriented nuclei is reported both in theory and experiment. In contrast to the purely magnetic (Zeeman) case, the quadrupole interaction P gives rise to a sweep-direction dependence of the resonance signal. This yields the sign of P and subsequent time development gives the nuclear-spin-lattice relaxation time. The magnitude of P can be obtained from the signal during passage even in the presence of inhomogeneous broadening Γ2IP. The technique is applied to Au198 nuclei in cubic ferromagnetic Fe and P=0.21±0.02 MHz is obtained. The quadrupole interaction is the result of spin-orbit coupling at the spin-polarized Au ion breaking the cubic-lattice symmetry. The Korringa constant CK for relaxation of the Au198 nuclei is measured as 1.2 K sec. © 1975 The American Physical Society. |
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