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85038326971
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It is important to be sure that any field or temperature dependence measured in the Hall coefficient is not a spurious effect associated with feedthrough of a small amount of the (formula presented) term. The zero of magnetic field can be accurately determined and in all cases the offset in (formula presented) at (formula presented) is subtracted from the (formula presented) is calculated. In sample B, where feedthrough effects are most likely to be important, this offset corresponds to 0.4% of (formula presented) and has the expected temperature dependence. While subtracting this term eliminates most of any feedthrough there is the possibility a small B-dependent term may remain. Up to 0.2 T the maximum observed magnetoresistance in (formula presented) is about 2.5% (at 0.28 K) corresponding to a contribution to the measured (formula presented). This may be compared with the experimentally observed deviation from linearity of about 85 (formula presented) at 0.2 T. At lower fields any B-dependent feedthrough was eliminated by making cubic fits to the data, over a field range of (formula presented), with the quadratic term set to zero. That is, the fit was forced to have the asymmetry required of the Hall resistivity and reject any B-dependent (formula presented) contribution. A similar analysis for sample A shows even smaller effects so for the field and temperature dependences of (formula presented) reported in Figs. 77 and 88, only a very small contribution, certainly less than 0.1% of (formula presented) might be attributed to spurious feedthrough of a (formula presented) term
-
It is important to be sure that any field or temperature dependence measured in the Hall coefficient is not a spurious effect associated with feedthrough of a small amount of the (formula presented) term. The zero of magnetic field can be accurately determined and in all cases the offset in (formula presented) at (formula presented) is subtracted from the (formula presented) is calculated. In sample B, where feedthrough effects are most likely to be important, this offset corresponds to 0.4% of (formula presented) and has the expected temperature dependence. While subtracting this term eliminates most of any feedthrough there is the possibility a small B-dependent term may remain. Up to 0.2 T the maximum observed magnetoresistance in (formula presented) is about 2.5% (at 0.28 K) corresponding to a contribution to the measured (formula presented). This may be compared with the experimentally observed deviation from linearity of about 85 (formula presented) at 0.2 T. At lower fields any B-dependent feedthrough was eliminated by making cubic fits to the data, over a field range of (formula presented), with the quadratic term set to zero. That is, the fit was forced to have the asymmetry required of the Hall resistivity and reject any B-dependent (formula presented) contribution. A similar analysis for sample A shows even smaller effects so for the field and temperature dependences of (formula presented) reported in Figs. 77 and 88, only a very small contribution, certainly less than 0.1% of (formula presented) might be attributed to spurious feedthrough of a (formula presented) term.
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38
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85038295404
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V. Senz, U. Dötsch, U. Gennser, T. Ihn, T. Heinzel, K. Ensslin, R. Hartmann, D. Grützmacher.
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V. Senz, U. Dötsch, U. Gennser, T. Ihn, T. Heinzel, K. Ensslin, R. Hartmann, D. Grützmacher.
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46
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85038276222
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The theoretical curves shown in Fig. 1010 have been calculated assuming the crossover functions (formula presented) and (formula presented) are 1. Over the range shown this will lead to small errors, of order 0.1 (formula presented)
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The theoretical curves shown in Fig. 1010 have been calculated assuming the crossover functions (formula presented) and (formula presented) are 1. Over the range shown this will lead to small errors, of order 0.1 (formula presented).
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