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UNIQUE PROPERTIES OF SUPERCONDUCTORS
Idealized Critical Tunneling Current versus Magnetic Field
SUPERCONDUCTING MAGNETIC SHIELD
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applied field approximately axial field becomes superconducting capacitor cm long COIL COIL copper wire critical temperature cycle Dewar dielectric dielectric barrier eddy currents electrical resistivity electroplated equation evaporated experiments field changes Figure l5 flux change flux gate flux motion flux unit indium inductance inside insulated Josephson effect Josephson junctions l0 G lambda point layer liquid helium bath lock-in detector loop low field magnetic field magnetic flux MAGNETOMETER CIRCUIT maximum measured Meissner MEISSNER-EFFECT MAGNETOMETER MEISSNER-EFFECT MODULATOR modulation efficiency modulator core modulator material modulator was mounted Mu-metal niobium niobium wire normal persistent current pickup coil pickup winding preamplifier quantized quantized-flux magnetometer QUANTIZED-FLUX MODULATOR quartz quartz tube reduced resistive film room temperature Section shield axis shown in Figure skin depth slug solder solenoid studies super superconducting cylinder SUPERCONDUCTING MAGNETIC SHIELD superconducting modulator superconducting shield switched thermal environment thermal relaxation transverse field tunneling junction voltage walls zero