1. Department of Physics, College of Science, Engineering and Technology, University of South Africa, Private Bag X6, Florida, 1710, Science Campus, Christiaan de Wet and Pioneer Avenue, Florida Park, Johannesburg, South Africa
2. Department of Physics, Faculty of Engineering and Technology (ITER), Siksha ‘O’ Anusandhan University, Bhubaneswar 751 030, Odisha, India
3. Department of Physics, Tamkang University, Tamsui 251, Taipei, Taiwan
4. Highly Correlated Matter Research Group, Physics Department, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa