A saturation NMR method is introduced with which near a Zeeman-tunneling resonance the ratio of the Zeeman and tunneling specific heats as well as the Zeeman-tunneling coupling time can be determined. In addition, by measurement of the coupling time at different Larmor frequencies the tunneling splitting can be obtained with good accuracy ({~}1%). This method is useful in the tunneling splitting range 10^-2 to 1 {μ}eV, which is just below the resolution limit of inelastic neutron spectroscopy.
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Bharaj et al. (1984) studied this question.
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