Abstract
Based on transport and magnetic measurements on Gd(Ba2−xPrx)Cu3O7+δ, and some other properties of high temperature superconductors (HTSC), we have extracted similarities between superconductors, two-dimensional electron gas (2D-EG) i.e. MOSFETs and ultrathin films of conventional superconductors. These are based on properties such as superconductor–insulator transition in superconductors and metal–insulator transition (MIT) in 2D-EG with doping and magnetic field, localization in transport conduction, quantum unit of resistance at MIT, larger change in resistance from critical doping to the insulating side in comparison with change from critical doping to the metallic side and strong electron–electron coupling. These similarities could lead to a deeper understanding of HTSC and 2D-EG systems.
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