Abstract
SHS investigation development is considered from the geographical and historical viewpoint. 3 stages are described. Within Stage 1 the work was carried out in the Department of the Institute of Chemical Physics in Chernogolovka where the scientific discovery had been made. At Stage 2 the interest to SHS arose in different cities and towns of the former USSR. Within Stage 3 SHS entered the international scene. Now SHS processes and products are being studied in more than 50 countries.
Abstract
A detailed analysis of electronic band structure of the ScAuSn, LuAuSn and their Superlattice have been performed using the full potential linearized augmented plane waves (FP-LAPW). The exchange-correlation between the electrons was treated with three schemes, generalized gradient approximation (GGA), Trans and Blaha modified Becke-Johnson potential (TB-mBJ) and Spin-Orbit Coupling (SOC) incorporated with GGA. The GGA method reveals an indirect spin-gapless semiconducting nature for LuAuSn, an indirect band gap semiconducting nature for ScAuSn and direct semiconducting nature for their superlattice whereas under mBJ scheme, the band gap values are found to be enhanced. The inclusion of Spin-Orbit Coupling effects in GGA predicts the materials to be semi-metallic. The density of states is mainly dominated by the Sc and Lu atom near the vicinity of Fermi energy level and in the conduction region in ScAuSn and LuAuSn alloys, respectively whereas in superlattice the density of states is mainly dominated by Sc atom with significant contribution from Sn atoms.
Keywords:
Half-metal, Spin-gapless semiconductor, Semi-metal, Superlattice.
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Authors:Bentham Science Books