Abstract
The observed variation in superconducting transition temperature ( T c) in Zr 2M (M=Fe, Co, Ni, Rh) compounds is explained on the basis of band filling with increasing electron to atom ratio. The relatively large T c in Zr 2Co and Zr 2Rh arises due to the Fermi level ( E F) lying at the peak of the density of states (DOS), while in case of both Zr 2Fe and Zr 2Ni, E F lies in the valley of DOS. The values of DOS at the Fermi level ρ( E F), as estimated from measured specific heat data are compared with those from the calculated electronic structure. Also estimated are the electron-phonon coupling constant (λ), the Debye temperature (Θ D) and the electronic specific heat coefficient (γ).
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