2026-04-13T07:27:23Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/1117352026-01-21T05:38:15Zcom_2072_1033col_2072_452950

Glassy Anomalies in the Low-Temperature Thermal Properties of a Minimally Disordered Crystalline Solid Gebbia, Jonathan Fernando Ramos, M. A. Szewczyk, Daria Jezowski, Andrzej Krivchikov, Alexander Horbatenko, Y.V Guidi, T. Bermejo, F. J. Tamarit Mur, José Luis Àrees temàtiques de la UPC::Física Anisotropy Crystals Anisotropia Cristalls 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. Peer Reviewed Postprint (published version) 2017-11-21 Article https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.119.215506 http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Open Access Attribution-NonCommercial-NoDerivs 3.0 Spain