salamou alaikum Here some links but how to download the files? https://prb.aps.org/abstract/PRB/v73/i23/e235101 https://prb.aps.org/abstract/PRB/v55/i16/p10337_1 https://prl.aps.org/abstract/PRL/v74/i20/p4035_1 https://prb.aps.org/abstract/PRB/v50/i17/p13035_1 Allah yjazik khayran my brother Thank you in davance!