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Experimental results of the thermal conductivity ( k ( T )) of nanostructured g-As 2 S 3  during cooling and heating processes within the temperature range from 2.5 to 100 K have been analysed. The paper has considered thermal conductivity is weakly temperature  k ( T ) dependent from 2.5 to 100 K showing a plateau in region from 3.6 to 10.7 K during both cooling and heating regimes. This paper is the first attempt to consider the  k ( T ) hysteresis above plateau while heating in the range of temperature from 11 to 60 K. The results obtained have not been reported yet in the scientific literature. Differential curve Δ k ( T ) of  k ( T ) (heating  k ( T ) curve minus cooling  k ( T ) curve) possesses a complex asymmetric peak in the energy range from 1 to 10 meV. Δ k ( T ) reproduces the density of states in a  g ( ω )/ ω   2  representation estimated from a boson peak experimentally obtained by Raman measurement within the range of low and room temperatures. Theoretical and experimental spectroscopic studies have confirmed a glassy structure of g-As 2 S 3  in cluster approximation. The origin of the low-frequency excitations resulted from a rich variety of vibrational properties. The nanocluster vibrations can be created by disorder on atomic scale.

Hysteresis of Low-Temperature Thermal Conductivity and Boson Peak in Glassy (g) As2S3: Nanocluster Contribution