Fluctuation Diamagnetism of Aluminum and Aluminum Alloys Above the Superconducting Transition Temperature |
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Page 8
... region about > min and minimization of F is almost equivalent to minimization of FGL • ( 9 ) In the region above T and outside the critical region , Schmid C indicated the procedure to follow in order to perform this integral : We can ...
... region about > min and minimization of F is almost equivalent to minimization of FGL • ( 9 ) In the region above T and outside the critical region , Schmid C indicated the procedure to follow in order to perform this integral : We can ...
Page 54
... region , where it is connected to a low noise , high input impedance wideband amplifier . In this region it is possible to apply various low- frequency flux signals to the SQUID by injecting r.f. by - passed currents into the tank ...
... region , where it is connected to a low noise , high input impedance wideband amplifier . In this region it is possible to apply various low- frequency flux signals to the SQUID by injecting r.f. by - passed currents into the tank ...
Page 57
... REGION 2 REGION 1 REGION 3 L / 2 REGION 4 Fig . 11 . Schematic diagram of the sample - magnet - shield configuration . F. Calibration It was shown previously that using a large -57-
... REGION 2 REGION 1 REGION 3 L / 2 REGION 4 Fig . 11 . Schematic diagram of the sample - magnet - shield configuration . F. Calibration It was shown previously that using a large -57-
Common terms and phrases
Al-Si alloys amplitude apparatus applied field applied flux behavior bulk transition C₁ C₂ calculated calibration coherence length concentration configuration copper block coupling Curie constant curve diamagnetic diameter dirty end coils equation equilibrium experimental field dependence field H fluctuation effects fluctuation magnetization flux transformer free energy frequency function heater high fields high temperature homogeneous impurities indium inductance Johnson noise leads Lee and Payne limit lock-in amplifier low fields magnetic field magnetometer main magnet mean free path measurements microscopic theory noise nuclear paramagnetism nucleation observed obtained paramagnetism parameter pickup coil plotted polycrystal possible Prange predicted quenched ratio region resistance resistor S-N transition scaling field Schematic secondary coil sensitivity shielding current shown in Fig signal single crystal slow cool solute specimens SQUID SQUID hole superconducting superconducting shield superconducting transition supercooling tank circuit temperature dependence thermal thermometer transition temperature voltage wire zero