Affiliation: | a Department of Physics, Presidency College, Chennai 600 005, India b Centre for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan c Department of Physics, Indian Institute of Technology Madras, Chennai 600 035, India d School of Physics, University of Hyderabad, Hyderabad, 500 046, India e Materials Science Centre, Department of Nuclear Physics, University of Madras, Guindy Campus, Chennai 600 025, India f Department of Physics, Pukyong National University, Busan 608 737, South Korea |