Structural and electronic properties of superconducting Heusler alloy Ni$_{2}$Nb$_{1+x}$Sn$_{1-x}$: \textit{Ab initio} approach

Soumyadipta Pal

doi:10.1016/j.commatsci.2013.02.016

paper

Structural and electronic properties of superconducting Heusler alloy Ni $_{2}$ Nb $_{1 + x}$ Sn $_{1 - x}$ : \textit{Ab initio} approach

arXiv:1209.4964 · doi:10.1016/j.commatsci.2013.02.016

Abstract

Using \textit{ab initio} calculation, we investigate systematically the structural and electronic properties of Ni $_{2}$ Nb $_{1 + x}$ Sn $_{1 - x}$ ( $x$ = 0, 0.25, 0.50). Here, projector augmented wave approach (PAW) implemented in the Vienna \textit{ab initio} simulation package (VASP) within generalized gradient approximation (GGA) for the exchange-correlation functional has been used. In this article, it is reported that though Ni $_{2}$ NbSn and Ni $_{2}$ Nb $_{1.25}$ Sn $_{0.75}$ have no structural transformation, Ni $_{2}$ Nb $_{1.5}$ Sn $_{0.5}$ can transform to tetragonal structure from cubic L2 $_{1}$ phase. The cubic lattice parameter decreases with Nb doping at Sn sites in off-stoichiometric alloys. The alloys are in paramagnetic phase in all the structures. The hybridization between Ni and Nb 3d states triggers the tetragonal distortion. Due to Nb doping in cubic L2 $_{1}$ phase, there is a significant change in total density of states (DOSs) at Fermi energy (E $_{F}$ ) (N(E $_{F}$ )). N(E $_{F}$ ) increases with increasing Nb doping. But, N(E $_{F}$ ) decreases during structural transformation of Ni $_{2}$ Nb $_{1.5}$ Sn $_{0.5}$ . The superconducting critical temperature (T $_{C}$ ) also changes with Nb doping in cubic phase and tetragonal distortion because T $_{C}$ very much depends on N(E $_{F}$ ).

Due to substantial overlap with concepts and discussions with other co-workers on other systems, the paper has been withdrawn

References in corpus (1)

Superconductivity in the Heusler Family of Intermetallics

Structural and electronic properties of superconducting Heusler alloy Ni2​Nb1+x​Sn1−x​: \textit{Ab initio} approach

Abstract

References in corpus (1)

Structural and electronic properties of superconducting Heusler alloy Ni $_{2}$ Nb $_{1 + x}$ Sn $_{1 - x}$ : \textit{Ab initio} approach