Advances in Electronics and Electron Physics, Vol. 70 by Peter W. Hawkes (Ed.)

By Peter W. Hawkes (Ed.)

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29. Here we see the two-dimensional voltage signal 6 V(x, y) for increasing and decreasing sample voltage. The signal is used for modulating the brightness on the oscilloscope screen. At the top of the figure the signal generated by the backscattered electrons is indicated for identification of the sample location. 5 K. Figure 30 presents the voltage signal obtained under identical conditions as in Fig. 29 plotted against the longitudinal sample coordinate (y-modulation). As we expect, a localized voltage signal 6V(x,y) appears at the two hotspot boundaries.

It appears that the first case is valid for most junction materials. The second case, which has not been studied in LTSEM experiments up to now, can arise for A1 as the material of the junction electrodes (Gross and Koyanagi, 1985). So far we have given only a qualitative discussion of the origin of the voltage signal 6 V ( x , y )for the various bias points on the quasiparticle IVC. , 1985; Huebener and Seifert, 1984). , 1985). In this way, for example the high and low energy gap in the detector junction of a double junction configuration, where the detector was only partly covered by the injector, could be determined accurately.

15, the different vortex states show reasonably regular behavior. The small shifting of the signal seen at the highest vortex states containing 12-14 vortices was accompanied by an increasing difficulty at higher magnetic fields to accurately reproduce the recorded signal during repeated line scans. It appears that these high vortex states are extremely sensitive to small perturbations. 26 R. P. 0 - - 0 1 I I I I I I I -30 -20 -10 0 10 20 IF ImAl FIG. 16. Magnetic interference pattern (&-Hcharacteristic) for the same sample as that of Fig.

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