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Specific heat and electronic structure of Heusler compounds Ni2TAl (T=Ti, Zr, Hf, V, Nb, Ta)

1999; Elsevier BV; Volume: 269; Issue: 2 Linguagem: Inglês

10.1016/s0921-4526(99)00102-7

1873-2135

Fábio Saraiva da Rocha, G.L.F. Fraga, D.E. Brandão, C.M. da Silva, A. A. Gomes,

Inorganic Chemistry and Materials

Low-temperature specific heat measurements (3.2 to 10.3 K) of Ni2TAl (T= Ti, Zr, Hf, V, Nb, Ta) Heusler compounds are presented. Experimental data are well described by the electronic and Debye lattice specific heat contributions, plus one Einstein term. The electronic structure of the compounds is calculated using the LMTO-TB method. The experimental to theoretical ratios (R) of the electronic specific heat coefficient (γ) were determined for the isoelectronic compounds corresponding to Ti and V. The electron–fonon coupling constants (λ) were extracted from these R values. A simple estimate of the elastic constant ratio is also made.