[Peng, Qiong] Hengyang Normal Univ, Inst Condensed Phys, Hengyang 421002, Peoples R China.
[Peng, Qiong] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.
[Peng, Qiong] Natl Univ Def Technol, Dept Phys, Changsha 410073, Hunan, Peoples R China.
[Rehman, Javed] Baluchistan Univ Informat Technol Engn & Managemen, Dept Phys, Quetta 87300, Baluchistan, Pakistan.
[Butt, Mehwish Khalid; Wang, Shuanhu] Northwestern Polytech Univ, Sch Phys Sci & Technol, Shaanxi Key Lab Condensed Matter Struct & Properti, Xian 710072, Peoples R China.