Disorder effects on heat transport properties of orientationally disordered crystals

Article

关键词: TEMPERATURE THERMAL-CONDUCTIVITY;    TUNNELING STATES;    GLASS;    DYNAMICS;    PHONONS;    MODES;   

DOI  :  10.1103/PhysRevB.81.094205

来源: SCIE

【 摘 要 】

The thermal conductivity k(T) of the orientational glass state of 1,2-difluoro-1,1,2,2-tetrachloroethane (CFCl2-CFCl2, Freon 112) and cyanocyclohexane (C6H11CN) has been measured under equilibrium pressure within the temperature range 2-100 K. The results show that the soft-potential model is able to account for low-temperature data and, indeed, quantitative agreement of all data considered is found within this realm. The details beyond such temperatures are heavily dependent on chemical details and a large plateau is observed for Freon 112 which is rationalized in terms of resonant scattering of phonons by simple oscillators. Such a view is given additional support by the presence of a strong low-frequency feature in the generalized frequency spectrum of the former material as proven by inelastic neutron-scattering spectroscopy.

【 授权许可】

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