Variable range hopping conduction in yttrium–graphene oxide nanocomposites I. Dhanya, Nikhila Ann Abraham, Sreejith K. Pisharady, P. S. Jayalakshmi, Issac Johnson, Lekshmy Priya, K. Maheesha and Mohith K. Madhav Eur. Phys. J. B, 98 4 (2025) 64 Published online: 16 April 2025 DOI: 10.1140/epjb/s10051-025-00915-4