[1] VIT, Sch Adv Sci, Thin Films Lab, Vellore 632014, Tamil Nadu, India
[2] Akita Univ, Ctr Reg Revitalizat Res & Educ, Akita 0108502, Japan
[3] VIT, Ctr Crystal Growth, Thin Films Lab, Vellore 632014, Tamil Nadu, India
[4] VIT AP, Dept Phys, Amaravati 522237, Andhra Prades, India
[5] Sungkyunkwan Univ, Dept Phys, Suwon 16419, South Korea
[6] Sungkyunkwan Univ, Sungkyunkwan Adv Inst Nanotechnol SAINT, Suwon 16419, South Korea
[7] Sungkyunkwan Univ, Sch Adv Mat Sci & Engn, Suwon 16419, Gyeonggi, South Korea