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2017 ; 7
(ä): 43482
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Towards an accurate description of perovskite ferroelectrics: exchange and
correlation effects
#MMPMID28256544
Yuk SF
; Pitike KC
; Nakhmanson SM
; Eisenbach M
; Li YW
; Cooper VR
Sci Rep
2017[Mar]; 7
(ä): 43482
PMID28256544
show ga
Using the van der Waals density functional with C09 exchange (vdW-DF-C09), which
has been applied to describing a wide range of dispersion-bound systems, we
explore the physical properties of prototypical ABO(3) bulk ferroelectric oxides.
Surprisingly, vdW-DF-C09 provides a superior description of experimental values
for lattice constants, polarization and bulk moduli, exhibiting similar accuracy
to the modified Perdew-Burke-Erzenhoff functional which was designed specifically
for bulk solids (PBEsol). The relative performance of vdW-DF-C09 is strongly
linked to the form of the exchange enhancement factor which, like PBEsol, tends
to behave like the gradient expansion approximation for small reduced gradients.
These results suggest the general-purpose nature of the class of vdW-DF
functionals, with particular consequences for predicting material functionality
across dense and sparse matter regimes.