By A. O. Barut (auth.), Venzo De Sabbata, V. N. Melnikov (eds.)
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Extra info for Gravitational Measurements, Fundamental Metrology and Constants
Cage et al. /4/ showed that this temperature dependence not only occurs in the Hall resistivity ° but also in the longitudinal resistivity ° . They found that xy xx ß = 0) - p I = s • pMIN (3) I °xy I = IPxy (MIN °xx xy xx where MIN Pxx = linearily extrapolated to 0) is the value of p xy is the minimum value observed for 0xx. The constant s depends on the sampIe and its preparation. Von Klitzing and coworkers showed that /5/ MIN Mw 0xx - exp (- 2kT) (4 ) This behaviour shows that in higher magnetic fields (higher values of w), the temperature dependence in a certain temperature range is lower than it is in lower magnetic fields.
Observations of drift rates of resistances As mentioned above, our previous experimental set-up allowed the measurement of the ratio of a Hall resistance against a reference r~8istance of nominally the same value with a relative uncertainty of 3·10 . Drift rates of resistors can therefore be obtained in much shorter time than was possible before the discovery of the quantum Hall effect. Fig. 7 shows the drift rates of two resistors ~Sasured over aperiod of more than 30 days. They change by about 5·10 per day 11/.
6/ T. Witt, T. Endo, and D. Reymann: to be published in the Proc. of CPEM 86 in IEEE Instr. and Meas. / 7/ W. Schwitz, L. -J. Py, and M. Illegems: to be published in the Proc. of CPEM 86 in IEEE Instr. and Meas. / 8/ K. Shida, T. Wada, H. Nishinaka, M. Kobayashi, G. Yonezaki, T. Igarashi, and T. Nemoto: to be published in the Proc. of CPEM 86 in IEEE Instr. and Meas. / 9/ K. Yoshihiro, I. Kinoshita, K. Inagaki, and Ch. Yamanouchi: Phys. Rev. B 33, 6874 (1986). /10/ F. Delahaye, D. Dominguez, F.