Abstract

We report measurements of the specific heat of various crystalline ionic conductors: Li 3N, β-Eukryptite, Hollandite, Nasicon and Cu 6PS 5Cl for the temperature range between 1.5 (or 0.4 K) and 100 K. In each case an anomalous quasi-linear contribution is observed below 8 K similar to that found in amorphous materials below 1 K. In the ‘Nasicon’ compounds the additional specific heat strongly depends on the concentration of the tunneling ions.

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