کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1561264 | 1513942 | 2013 | 5 صفحه PDF | دانلود رایگان |
Using the full potential linearized augment plane wave method with the generalized gradient approximation and the modified Becke and Johnson potential as exchange correlation potential, the half-metallicity, electronic structure and heat of formation for hypothetical compounds MGe (M = Ca, Sr and Ba) with ZB and WZ structure are investigated. Calculations show that tetrahedral coordinated MGe alloys are half-metallicity, with magnetic moment of 2.00 (4.00) μB per cell for the ZB (WZ) structure. Magnetic moments are mainly from Ge-p states, where in p–d hybridization mechanism plays crucial role in forming the half-metallicity. The ferromagnetic ground states, larger half-metallic gaps, negative cohesive energy and heat of formation indicate tetrahedral coordinated MGe (M = Ca, Sr and Ba) compounds would be useful in spintronics.
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► We find tetrahedrally coordinated MGe compounds are half-metallicities.
► The p-d hybridization mechanism play crucial role in forming the half-metallicity.
► Negative cohesive energy and heat of formation imply MGe alloys are stable.
► MGe alloys could keep half-metallicity in a wide range of the lattice constants.
Journal: Computational Materials Science - Volume 67, February 2013, Pages 83–87