Specific heat capacity of molybdenum chalcogenides. IV. An investigation of the heat capacity of binary and halogen-substituted molybdenum chalcogenides

Abstract

Results of heat capacity measurements of Mo6Xs and Mo6X6Y2 compounds (X = S, Se, and Te; Y = Br and I) in the temperature range from 2 to 30 K and in a magnetic field of 50 kG are reported and discussed. The analysis of the C results is done on the basis of a lattice term composed of two Debye functions and one fiT 3 term. The characteristic frequencies for the phonon spectrum show systematic changes dependent on the structural parameters and the composition of the samples. The results obtained could be supplemented by means of Raman spectra. The determined 3" coefficients exhibit an apparent correlation to To. The results are discussed with consideration of the superconducting properties of the studied compounds.

Specific heat capacity of molybdenum chalcogenides. V. An investigation of the heat capacity of PbMo6S8, PbMo6Se8, and corresponding samples with depressed T cvalues

“…5 The complicated curvature of the CL term is the reason for the large differences in the results on the heat capacity (e.g., y values of the electronic heat capacity) from different investigations 2~ for molybdenum chalcogenides. It is also the reason, why in the case of chalcogenides the method proposed in Ref.…”