Abstract
The temperature dependence of the generalized phonon density of states (GDOS) of polycrystalline Mo(3)Sb(7) and Mo(3)Sb(5.4)Te(1.6) was studied from 300 K down to 2 K using inelastic neutron scattering. Even though Mo(3)Sb(7) undergoes a magnetic as well as a structural phase transition at T* = 53 K, no appreciable change in the recorded spectra has been revealed. The generalized density of states of the nonmagnetic Mo(3)Sb(5.4)Te(1.6) compound shows similar main characteristics, though substituting Sb by Te leads to a shift of the entire spectrum towards higher energy. The temperature dependence of the GDOS reveals an anomalous softening of phonons with decreasing temperature in Mo(3)Sb(7) which cannot be captured by the harmonic approximation while Mo(3)Sb(5.4)Te(1.6) exhibits a normal behavior. This feature might be related to a strong interplay between magnetic excitations and phonons at the core of the anomalous thermal transport displayed by Mo(3)Sb(7). In general, the main characteristics of the experimentally derived GDOS of Mo(3)Sb(7) can be reproduced by lattice dynamical calculations.
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