Nuclear alignment of implanted160Tb in highly oriented pyrolytic graphite layers |
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Authors: | B Kastelein B Borst A J de Jong H Postma H C Meijer |
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Institution: | (1) Dept. of Applied Physics, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands |
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Abstract: | Low-temperature nuclear alignment of160Tb ions implanted in Highly Oriented Pyrolytic Graphite has been observed by the anisotropic intensity distribution of γ-rays.
The data can be understood with an effective spin Hamiltonian containing combined magnetic and electric hyperfine interactions.
Values deduced for the hyperfine parameters are A/k=(101±7) mK for the magnetic interaction, and P/k=(−3.7±0.9) mK for the
nuclear electric quadrupole interaction, under the assumption that B=0 and Δ=0. Measurements in magnetic fields of 0.2 and
1.0 T directed along the graphite c-axis showed thermal saturation due to the strongly reduced heat conductivity of HOPG in
the presence of a magnetic field. |
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