Materials with zero resistance below critical temperature.
Superconductors have zero DC resistance below T_c and expel magnetic fields (Meissner effect). Type I and II; low-Tc NbTi/Nb₃Sn (4 K) and high-Tc YBCO/BSCCO (77 K). Applications: MRI magnets, fusion magnets, maglev, cables, SQUIDs. Cooling cost is a barrier.
MRI machines use NbTi coils cooled by liquid helium.
Superconductors carry current with no resistance, which enables very strong magnets, low-loss cables and sensitive detectors.
Materials with zero resistance below critical temperature.
Superconductors carry current with no resistance, which enables very strong magnets, low-loss cables and sensitive detectors.
The temperature below which a superconductor has zero electrical resistance, and there are also critical field and current limits.
Most superconductors work only at very low temperature, so cryogenic cooling is needed, although high-temperature superconductors reduce the cooling burden.
Typical applications include cooling a superconducting magnet for an MRI scanner, using superconducting cables to carry power in a dense city and building a magnetometer with a SQUID detector.
Study "Magnetic materials" first (topic 53 of 100 in Materials & Chemical). It covers the groundwork this topic builds on.
Critical current and field. Flux pinning. Quench protection.
MRI machines use NbTi coils cooled by liquid helium.
The next topic is "Optical and photonic materials", which builds directly on this one.
It is classed as Intermediate in Materials & Chemical (topic 54 of 100). It is an intermediate topic. Work through the beginner topics in Materials & Chemical first.
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