| Autor: |
Aminov, L., Volodin, A., Egorov, A., Naletov, V., Tagirov, M., Teplov, M., Feller, G. |
| Zdroj: |
Applied Magnetic Resonance; Jun1990, Vol. 1 Issue 1, p113-127, 15p |
| Abstrakt: |
The pulsed NMR method is applied to an analysis of a complicated structure of inhomogeneous internal fields in a ferromagnetic crystal. Proton magnetic resonance in the Ising ferromagnet TbES at a temperature range from 1.6 K down to 35 mK is studied at frequencies of 10-35 MHz. A complicated picture of static and fluctuating internal magnetic fields in the crystal is presented. Interatomic distances are shown to have an uncertainty of the order of 0.2% due to defects in the crystal lattice. The fluctuations of internal magnetic fields produced by thermal excitation and spin-spin relaxation of Tb ions give rise to the effective nuclear magnetic relaxation: 1/T∼exp (δ/kT), where δ is the energy splitting of the lowest Tb quasi-doublet. The rate of these fluctuations in TbES at low temperatures is approximately equal to 2×10 s being independent of temperature and magnetic field. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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