NMRON studies of the antiferromagnetic and paramagnetic phases of54Mn-MnCl2 · 4H2O |
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Authors: | M Le Gros A Kotlicki B G Turrell |
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Institution: | (1) Department of Physics, University of British Columbia, V6T 1Z1 Vancouver, B.C., Canada |
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Abstract: | Pulsed NMRON, CW NMRON and thermal NMR-NO methods have been utilized to study54Mn-MnCl2 · 4H2O. The54Mn spin-lattice relaxation timeT
1 in zero applied field has been measured between 35 and 90 mK in the antiferromagnetic phase. Above 65 mK the dominant relaxation
mechanism is a Raman process with the electronic magnons, but at lower temperatures a direct process takes over. NMRON has
been observed for the first time in the paramagnetic phase, and a line width of 300 kHz, with both homogeneous and inhomogeneous
contributions, is observed. In the antiferromagnetic phase the line width is 35 kHz, and there are also homogeneous and inhomogeneous
contributions. The dependence ofT
1 for the54Mn spins on field and temperature was studied in the paramagnetic phase. AT
1 minimum centred atB
0=2.64 T was observed. The hyperfine parameter <54
AS>/h=−513.6(3) MHz in the paramagnetic phase, and comparison with the value in the antiferromagnetic phase gives 0.013(1) for
the zero point spin deviation. |
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Keywords: | |
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