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flux quantization : ウィキペディア英語版 | flux quantization
Flux quantization is a quantum phenomenon in which the magnetic field is quantized in the unit of , also known variously as flux quanta, fluxoids, vortices or fluxons. ==About==
Flux quantization occurs in Type II superconductors subjected to a magnetic field. Below a critical field Hc1, all magnetic flux is expulsed (force out of body) according to the (effect ) and perfect diamagnetism is observed, exactly as in a Type I superconductor. Up to a second critical field value, ''H''c2, flux penetrates in discrete units while the bulk of the material remains superconducting. Both critical fields are temperature dependent, and tabulated values are the zero-temperature extrapolation unless otherwise noted.
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