thank you dear Laurence for your reply. I used these parameters:
RMT (Mn)=2.20 RMT (Nb)=2.32 RMT (As)=2.25 a.u. RKmax=8 k-point=8000 points which lead to 256 special k-points. cut-off energy = -6.5 and 7 Ry mixing factor = default value. and finally i do not use U potential.
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