PECULIAR OPTICAL PROPERTIES OF Co2MnGa ALLOYS

Authors

Rhee Joo Yull
Kudryavtsev Y.V.
Kim K.W.
Lee Y.P.

Abstract

Co2MnGa alloy was prepared by the conventional arc-melting method. The optical conductivity (OC) spectrum of the alloy was measured by a rotating-analyzer spectroscopic ellipsometer. The OC spectrum was also calculated based on the electronic structure by using the full-potential linearized-augmented-plane-wave method within the local-spin-density approximation to the density-functional theory. The calculated OC spectrum does not agree well with the experimental one. Since the Co2MnGa alloy could be a strongly-correlated material, the so-called 'LDA+U' method was applied with U = 5.4 eV. The calculated OC spectrum using the 'LDA+U' method agrees very well with the experimental one. The inclusion of the onsite Coulombpotential during the self-consistent calculation significantly modifies the minorityspin Co and Mn 3d bands, resulting in a contraction of the energy gaps between states which are strongly involved in interband absorption peaks.

Publication Date

11-15-2017

Recommended Citation

Yull, Rhee Joo; Y.V., Kudryavtsev; K.W., Kim; and Y.P., Lee (2017) "PECULIAR OPTICAL PROPERTIES OF Co2MnGa ALLOYS," ASEAN Journal on Science and Technology for Development: Vol. 24: No. 1, Article 16.
DOI: https://doi.org/10.29037/ajstd.181
Available at: https://ajstd.ubd.edu.bn/journal/vol24/iss1/16