Glassy Anomalies in the Low-Temperature Thermal Properties of a Minimally Disordered Crystalline Solid
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The low-temperature thermal and transport properties of an unusual kind of crystal exhibiting minimal molecular positional and tilting disorder have been measured. The material, namely, low-dimensional, highly anisotropic pentachloronitrobenzene has a layered structure of rhombohedral parallel planes in which the molecules execute large-amplitude in-plane as well as concurrent out-of-plane librational motions. Our study reveals that low-temperature glassy anomalies can be found in a system with minimal disorder due to the freezing of (mostly in-plane) reorientational jumps of molecules between equivalent crystallographic positions with partial site occupation. Our findings will pave the way to a deeper understanding of the origin of the above-mentioned universal glassy properties at low temperature.
CitationGebbia, J., Ramos , M., Szewczyk, D., Jezowski, A., Krivchikov, A., Horbatenko, Y., Guidi, T., Bermejo, F. J., Tamarit, J. L. Glassy Anomalies in the Low-Temperature Thermal Properties of a Minimally Disordered Crystalline Solid. "Physical review letters", 21 Novembre 2017, vol. 119, núm. 21, p. 215506-1-215506-6.