Abstract
Abstract Ion channeling is sensitive to very small shifts (10−2 nm) of the atomic equilibrium positions. As a consequence, this technique appears to be suitable to study lattice dynamics, in particular when a displacive phase transition occurs. As many phase transitions of interest are observed at low temperature, we developed a three-axis goniometer in order to perform channeling experiments between 5 and 30 K. As no thermal screen could be placed between the sample and the ion beam, the quantity of heat radiated onto the sample holder was very large. The technical solutions which were chosen to overcome this difficulty and ensure both an efficient cooling and a good rotational mobility of the sample are described in detail. A liquid-helium flow of ∼ 6.5 1/h was found to be necessary to achieve a continuous refrigeration of the sample at 5 K. To conclude, proton channeling experiments in the blue bronze, K0.3MoO3, are presented as an illustration of the device possibilities.
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