Ab initio GGA+U investigations of the structural, electronic, and magnetic properties of Cd1-xMnxTe alloy
Journal Article
·
· Proceedings of SPIE - The International Society for Optical Engineering
- Yuriy Fedkovych Chernivtsi National Univ. (Ukraine)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL)
The structural, electronic and magnetic properties of Cd1-xMnxTe alloy in the zinc-blende (ZB) phase within the framework of spin-polarized density functional theory using the generalized gradient approximation (GGA) are studied. In particular, we employ GGA+USIC method that gives a better description of systems with strong Coulomb correlations of the d-electrons. First, we discuss implementation of GGA+U method to the ground state calculations of pure CdTe and ferromagnetic MnTe. The alloy is modelled at some selected compositions by ordered structures described in terms of periodically repeated supercells for the compositions x = 0.25, 0.5, and 0.75. The compositional dependence of the lattice constant, electronic band structure and partial densities of states of ferromagnetic Cd1-xMnxTe alloy are studied. We estimate the spin-exchange splitting energies produced by the Mn 3d-states and determine the exchange constants for the conduction and valence bands of the alloy. The energy positions of the occupied and unoccupied Mn 3d-bands in the electronic structure of ferromagnetic Cd1-xMnxTe alloy are also presented. Our calculations using GGA+USIC approach agree well with the available experimental data and other calculations.
- Research Organization:
- Savannah River National Lab (SRNL), Aiken, SC (United States); Savannah River Site (SRS), Aiken, SC (United States)
- Sponsoring Organization:
- USDOE Office of Environmental Management (EM)
- Grant/Contract Number:
- AC09-08SR22470
- OSTI ID:
- 1604907
- Alternate ID(s):
- OSTI ID: 1638811
- Report Number(s):
- SRNL-STI--2019-00485
- Journal Information:
- Proceedings of SPIE - The International Society for Optical Engineering, Journal Name: Proceedings of SPIE - The International Society for Optical Engineering Vol. 111141; ISSN 0277-786X
- Publisher:
- SPIECopyright Statement
- Country of Publication:
- United States
- Language:
- English
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