Showing papers on "Coherent potential approximation published in 2023"

Effect of atomic anti-site disorder on the anisotropic magnetoresistance in Fe₅₀Co₅₀ alloys

Abstract: Abstract In order to understand the anti-site disorder effect on the anisotropic magnetoresistance (AMR) of alloys, Fe 50 Co 50 alloys were studied in this work using the fully relativistic spin-polarized Korringa-Kohn-Rostoker (SPR-KKR) method. The anti-site disorder was modeled by interchanging Fe and Co atoms and treated by the coherent potential approximation (CPA). It is found that the anti-site disorder broadens the spectral function and decreases the conductivity. Our work emphasizes that the absolute variations of resistivity under magnetic moment rotation are less affected by atomic disorder. The annealing procedure improves the AMR by reduction of the total resistivity. At the same time, we also find that the fourth-order term in the angular dependent resistivity becomes weaker when the disorder increases, resulting from increased scattering of the states around the band-crossing.

Superconductivity in high-entropy alloy system containing Th

Abstract: Abstract Th-containing superconducting high entropy system with the nomi-nal composition (NbTa)0.67(MoWTh)0.33 was synthesized. Its structural and physical properties were investigated by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, specific heat, resistivity and magnetic measurements.Two main phases of alloy were observed: major bcc structure and minor fcc. The experimental results were supportedby numerical simulation by the DFT Korringa-Kohn-Rostokermethod with the coherent potential approximation (KKR-CPA).

Effect of atomic anti-site disorder on the AMR in FeCo alloys

Abstract: In order to understand the anti-site disorder effect on the anisotropic magnetoresistance (AMR) effect in alloys, $\rm{Fe}_{50}Co_{50}$ alloys were studied in this work using the fully relativistic spin-polarized screened (KKR) method. The anti-site effect was modeled by interchanging Fe and Co atoms and treated by the coherent potential approximation (CPA). We find that the anti-site disorder broadens the spectral function and decreases the conductivity. Our work emphasizes that the absolute variations of resistivity under magnetic moment rotation are less affected by atomic disorders. The annealing procedure improves the AMR by reduction of the total resistivity. At the same time, we also find that the fourth-order term in the angular dependent resistivity becomes weaker when the disorder increases, resulting from increased scattering of the states around the band-crossing.