摘要
Mn_(3)TeO_(6)(MTO) has been experimentally found to adopt a P2_(1)/In structure under high pressure,which exhibits a significantly smaller band gap compared to the atmospheric R3 phase.In this study,we systematically investigate the magnetism,structural phase transition,and electronic properties of MTO under high pressure through first-principles calculations.Both R3 and P2_(1)/n phases of MTO are antiferromagnetic at zero temperature.The R3 phase transforms to the P2_(1)/n phase at 7.5 8 GPa,accompanied by a considerable volume collapse of about 6.47%.Employing the accurate method that combines DFT+U/and GW,the calculated band gap of R3 phase at zero pressure is very close to the experimental values,while that of the P2_(1)/n phase is significantly overestimated.The main reason for this difference is that the experimental study incorrectly used the Kubelka-Munk plot for the indirect band gap to obtain the band gap of the P2_(1)/n phase instead of the Kubelka-Munk plot for the direct band gap.Furthermore,our study reveals that the transition from the R3 phase to the P2_(1)/n phase is accompanied by a slight reduction in the band gap.
作者
潘小龙
王豪
柳雷
陈向荣
耿华运
Xiao-Long Pan;Hao Wang;Lei Liu;Xiang-Rong Chen;Hua-Yun Geng(College of Physics,Sichuan University,Chengdu 610065,China;National Key Laboratory of Shock Wave and Detonation Physics,Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621900,China;HEDPS,Center for Applied Physics and Technology,and College of Engineering,Peking University,Beijing 100871,China)
基金
Project supported by National Key Research and Development Program of China(Grant No.2021YFB3802300)
the Natural Science Foundation of China Academy of Engineering Physics(Grant Nos.U1730248 and U1830101)
the National Natural Science Foundation of China(Grant Nos.12202418,11872056,11904282,12074274,and 12174356)。