Leak tight vacuum seals for large windows and flanges at liquid helium temperatures

Abstract

current through the magnetized sample of 20 wt% in the two opposite directions which indicate asymmetry in the resistance of the sample (Fig. 1). Fig. 2 shows the temperature dependence of the reduced resistance, ie the ratio of the resistance at a given temperature (reduced against the critical temperature of the matrix) to the resistance in the normal state, for the sample containing 20 wt% ferromag. netic particles, both before and after magnetization for the both current directions. The estimated maximum errors of the measured values are shown in Fig. 2. As can be seen from Fig. 2, the values of the resistance measured with the current passing through the sample in the same direction as the magnetizating current are larger than the respective resistance values measured with the current passing in the opposite direction. The directional asymmetry of the electrical resistance has been found for aU circularly magnetized samples with the exception of the sample of 5 wt%.