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

โœ Scribed by N. E. Alekseevskii; G. Wolf; C. Hohlfeld; N. M. Dobrovolskii

Publisher
Springer US
Year
1980
Tongue
English
Weight
506 KB
Volume
40
Category
Article
ISSN
0022-2291

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โœฆ Synopsis

Results of measurements of the heat capacity of the ternary molybdenum chalcogenides PbMo6Ss, and PbMo6Ses and of samples with small Fe content PbFexMo6Ss (x = O. 05; O. 1) are presented and discussed. A strong decrease of Tc and increase of the y coefficient without any change of lattice contribution is observed as a consequence of the Fe doping. These results and the known phonon spectra of the pure samples are used to compute the CL from the Cexp values and with it to determine the y coefficient. The dependence of the different phonon contributions, the 3' and h~_p coefficients, and the N(EF) value on the composition of the chalcogenides is discussed by comparison with results from earlier investigations and in connection with the critical parameters of the superconducting state.

' ~N(EF) in states/eV atom-spin. bThis work.

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The heat capacity of molybdenum chalcogenides with different Sn/ Ga content was measured at temperatures of T <-60 K. The occurrence of two phases of the chalcogenides studied could clearly be seen for higher Ga concentrations. In the miscibility gap there coexists a superconducting phase (Tr = 12.5