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Temperature Dependence of Nuclear Magnetic Resonance and Spin–Lattice Relaxation Time of 23 Na in a NaMnCl 3 Single Crystal
Author(s) -
Lim A. R.,
Choh S. H.,
Jeong S. Y.
Publication year - 1997
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(199701)199:1<231::aid-pssb231>3.0.co;2-r
Subject(s) - quadrupole , coupling constant , hyperfine structure , single crystal , relaxation (psychology) , chemistry , atmospheric temperature range , asymmetry , spin–lattice relaxation , crystal (programming language) , condensed matter physics , ion , nuclear magnetic resonance , atomic physics , nuclear quadrupole resonance , crystallography , physics , psychology , social psychology , organic chemistry , particle physics , quantum mechanics , meteorology , computer science , programming language
The temperature dependence of 23 Na ( I = 3/2) nuclear magnetic resonance in a NaMnCl 3 crystal grown by the Czochralski method has been investigated by employing a Bruker FT NMR spectrometer. From the experimental data, the quadrupole coupling constant and asymmetry parameter are determined in the temperature range of 140 to 380 K. The principal z ‐axis of the EFG tensor of 23 Na, the largest component, is parallel to the crystallographic c ‐axis. The quadrupole coupling constant of 23 Na is found to be linearly increasing as the temperature increases. We have discussed the transferred hyperfine interaction due to the transfer of spin density from the Mn 2+ ion to the Na + ion in a NaMnCl 3 single crystal. In addition, the temperature dependence of the relaxation time T —1 1 could be fitted by the approximation T —1 1 = {4.88 T — 228.15} (s —1 ). Therefore, we conclude that the dominant contribution to the relaxation rate is explained by the direct process of scattering with a single phonon.