Abstract
A low frequency impurity mode in KCl:Li first observed through phonon resonance scattering in thermal conductivity measurements, has since been explained through tunneling states associated with a quasi-rotational motion of the small Li+ ion between its 8 equilibrium positions located in the <111> crystallographic directions. A recent review of the extensive work which led to this model is given in ref. 1. We have investigated these tunneling states through specific heat measurements in a demagnetization cryostat.(2)
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Research supported in part by the U. S. Atomic Energy Commission under contract AT(30–1) -2391, Technical Report No. NY0–2391–59, and by the Advanced Research Projects Agency through the use of the central facilities of the Cornell Materials Science Center.
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Harrison, J.P., Peressini, P.P., Pohl, R.O. (1968). Study of an Impurity Mode Through Specific Heat Measurements Between .05 and 2.5°K. In: Wallis, R.F. (eds) Localized Excitations in Solids. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-6445-8_49
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