<div dir="ltr"><div>hi,</div><div> thanks for reply. the assymetry parameter, (Vxx-Vyy)/Vzz, is zero (wien2k calculation) whereas i got 0.52 from TDPAC (Time dependent perturbed angular correlation) spectroscopy for a SrTiO3 (STO) defect structure. EFG component is -1.63 x10^21 V/m2 (wien2k, lapw2 -efg) and i obtained 1.69 x 10^21 V/m2 (calculated from TDPAC results). STO has cubic lattice so no efg and no assymetry parameter (for both wien2k and TDPAC) but defect STO structure showed very pure hyperfine interactions with assymetry parameter : 0.52. So i am not having confidence over my wien2k calculation because :</div><div>1. i am getting assymetry parameter =0</div><div>2. Negative EFG which i understood from previous answers that negative sign indicates the rate of decrease of z-component of EF wrt to distance. <br></div><div><br></div><div>Am i missing something?, <br></div><div>Calculation parameters are :Supercell (3x2x2) STO with doped Hf atom, PBE, KGEN:200, rkmax: 7.0, <br></div><div><br></div><div>thanks,</div><div>A. Kumar<br></div></div><br><div class="gmail_quote"><div dir="ltr">On Fri, Dec 14, 2018 at 11:02 PM Ashwani Kumar <<a href="mailto:ashwani.ism@gmail.com">ashwani.ism@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Hi, <br></div><div> i have calculated EFG the defect structure of crystalline system from experimental data from PAC spectroscopy. Then using WIEN2K (crystal structure--> supercell--> defect introduced), EFG is calculated. <br></div><div>Exper. Calculated : 1.69 x 10^21 V/m2 whereas wien2k calculation: -1.66 x 10^21 V/m2 (crude value still have to do lapw2 -efg) on probe atom. Wien2k calculation shows negative value. is there any significance of the negative sign.</div><div><br></div><div>thanks,</div><div>A. Kumar<br></div></div>
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