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Low-temperature specific heats of an anisotropic superconductor, HgxNb3Te4

Measurements of the specific heat of HgxNb3Te4 with are reported for the temperature range K. The lattice contribution to the specific heat is adequately fitted by a combination of two Debye terms with the Debye temperatures θD of about 15 and 105 K. The data are discussed in terms of several contributions to the Debye term with θD = 15 K: contributions made by CDW formation, Nb atoms displaced from their normal sites and inserted atoms. The bulk superconductivity in Nb3Te4 has been observed by adding Hg, but only a small fraction of the material is superconducting. The electronic contribution γT to the specific heat increases considerably with the addition of Hg. The increase in γT is discussed in terms of a set of bands of electrons and holes.