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As shown by Madsen et al. (2001) this new scheme converges practically to identical results as the LAPW method, but allows to reduce ``RKmax'' by about one, leading to significantly smaller basis sets (up to 50 %) and thus the corresponding the computational time is drastically reduced (up to an order of magnitude). Within one calculation a mixed ``LAPW and APW+lo'' basis can be used for different atoms and even different l-values for the same atom (Madsen et al. 2001). In general one describes by APW+lo those orbitals which converge most slowly with the number of PWs (such as TM 3d states) or the atoms with a small sphere size, but the rest with ordinary LAPWs. One can also add a second ``lo'' at a different energy so that both, semicore and valence states, can be described simultaneously.
(I) inside atomic sphere t of radius Rt a linear combination of radial functions times spherical harmonics Ylm(r) is used (we omit the index t when it is clear from the context)
The program package WIEN2k allows to perform electronic structure calculations of solids using density functional theory (DFT). It is based on the full-potential (linearized) augmented plane-wave ((L)APW) + local orbitals (lo) method, one among the most accurate schemes for band structure calculations. WIEN2k is an all-electron scheme including relativistic effects and has many features. It has been licensed by more than 3000 user groups and has about 12000 citations on Google scholar (Blaha WIEN2k).
One can also consider interactions with an external magnetic (see Novak 2001) or electric field (via a supercell approach, see Stahn et al. 2000).
PROPERTIES:
The density of states (DOS) can be calculated using the modified tetrahedron method of Blöchl et al. 94.
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