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Temperature dependence of the electrical conductivity and thermoelectric power in MoTe 2 single crystals
Author(s) -
Conan A.,
Delaunay D.,
Bonnet A.,
Moustafa A. G.,
Spiesser M.
Publication year - 1979
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220940132
Subject(s) - thermal conduction , seebeck coefficient , impurity , condensed matter physics , materials science , scattering , band gap , electrical resistivity and conductivity , dielectric , effective mass (spring–mass system) , thermoelectric effect , carrier scattering , crystallite , conductivity , electron , atmospheric temperature range , thermal conductivity , chemistry , optics , physics , optoelectronics , thermodynamics , organic chemistry , metallurgy , composite material , quantum mechanics
Thermoelectric power and de electrical conductivity measurements are made on MoTe 2 single crystals in a wide temperature range (77 to 770 K). The results are analyzed on the basis of impurity conduction. It is shown that three processes contribute to the total conductivity: hopping conduction between impurity sites, scattering by optical modes, and, in the intrinsic domain, scattering by impurities. The thermal energy gap (0.99 eV) is approximately the same as the optical one (1.03 eV). The effective mass of electrons in the conduction band is not very different from the mass of the free electron ( m * = 0.76 m ), and the dielectric constant of the medium is K ≈ 34. The agreement between theoretical and experimental results is quite good. A comparison with previous results performed on compact polycrystalline samples is given.