Influence of soft and rigid low frequency vibrations of AsnSm chains and rings in g-As2S3 on the low temperature anomalies

Abstract

The study of the g-As2S3 thermal conductivity k (T) revealed the temperature hysteresis at low temperature in the temperature range between 11 and 60 K with cooling and heating rates, v1 = 6.4 × 10-3K/s and v2 = 6.9 × 10-3 K/s, respectively. The difference curve ∆k(T) = kheating(T) – kcooling (T) indicate that the position of the energy maximum ∆k (T) has comparable energy as the position of the maximum in density of states (g (ω)) of low frequency (LF) Raman “Boson Peak” (“BP”) using scale g (ω)/ ω 2 , EBP ≈ 2.0 meV. The existence of “plateau” was observed in the temperature dependence of the thermal conductivity in the temperature interval from 3.6 to 10.7 K.