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K. Sundaram
Department of Physics, Alagappa University, Karaikudi, 630 003, India
M. Raja
Department of Physics, Kalasalingam University, Krishnankoil, 626 790, India
S. Thanikaikarasan
Centre for Scientific and Applied Research, School of Basic Engineering and Science, PSN college of Engineering and Technology, Tirunelveli, 627 152, India
J. Chu
Department of Polymer Engineering, National Taiwan University of Science and Technology, Taipei, 10907, Taiwan
T. Mahalingam
Department of Physics, Alagappa University, Karaikudi, 630 003, India