ULTRASONIC ATTENUATION AND VELOCITY IN Cd0.55 Mn0.45Te+

P. Maheswaranathan , R. Sladek , U. Debska

We deduce the electromechanical coupling factor, piezoelectric constant (e14), and electrical conductivity of Cd0.55Mn0.45Te from the attenuation maximum and velocity change of piezoelectrically-active [110][001] ultrasonic shear waves which occur as a function of temperature, T. Electromechanical coupling and el4 are much larger in Cd0.55Mn0.45Te than in CdTe due to less bond charge transfer in the former because, we believe, of hybridization of Mn 3d orbitals into the tetrahedral bonds. The dc resistivity was measured and found to be an exponential function of 1/T in accord with the electrical conductivity deduced from our ultrasonic data. The conductivity activation energy we identify with the ionization energy of centers which provide mobile charge carriers (holes).

Domaines: Articles anciens

P. Maheswaranathan, R. Sladek, U. Debska. ULTRASONIC ATTENUATION AND VELOCITY IN Cd0.55 Mn0.45Te+. Journal de Physique Colloques, 1985, 46 (C10), pp.C10-513-C10-516. ⟨10.1051/jphyscol:198510113⟩. ⟨jpa-00225314⟩