Example image of eyePlorer eyePlorer map for 'Superconductivity': Material Temperature Electrical resistance Magnetic field Meissner effect Heike Kamerlingh Onnes Atomic spectral line Ferromagnetism Quantum mechanics Classical physics Perfect conductor Electrical conductor Resistivity Copper Silver Absolute zero Critical point (thermodynamics) Electric current Superconducting wire Alloy Aluminium Doping (semiconductor) Semiconductor Tin Gold Noble metals Ceramic Cuprate Kelvin Perovskite (structure) High-temperature superconductivity Liquid nitrogen History of superconductivity Thermal mass Phase (matter) Electrical network Voltage Ohm's law Electromagnet Magnetic resonance imaging Universe Electron Ion Heat Kinetic energy Cooper pair Phonon Band gap Energy spectrum Boltzmann constant