Hall constant

Phase Hall constant R. (cmVcoul) lo Accuracy ( ), (cmV coul) 10 4 Ref. Year Remarks 

Phase Magnetic susceptibility, x-106 (per mole) Effective magnetic moment Meff Bohr magneton Temperature, K Ref. Year Remarks 

Phase Frequency, cps Tem- pera- ture, C Dielec -trie constant Scattering coefficient Ref. Year 

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Electrical Resistivity 75 oDcm Superconductive Transition Temperature <1.2K Hall Constant -0.47x10"4 cm /A s... 

Electrical Resistivity 37-45 pDcm Superconductive Transition Temperature < 1.2K Hall Constant -12.4 x lO " cm A s Magnetic Susceptibility -23 x 10 emu/mol... 

Electrical Resistivity 35 pGcm Superconductive Transition Temperature 6K Hall Constant -1.3 x 10 " cmVA s Magnetic Susceptibility +15.3 x 10 emu/mol... 

Electrical Resistivity 17-22pDcm Superconductive Transition Temperature lO.OK Hall Constant - 21.8 x 10 " cm /A s at20°C Magnetic Susceptibility + 10 x 10 emu/mol... 

The conclusion regarding the fact that constant current conductivity involves not all microcrystals of the sample is proved by results of measurements of electric conductivity in sintered ZnO films in case of alternating current (Fig. 2.10). The availability of barrier-free ohmic pathways is proved by a low value of initial resistivity in sintered samples ( 1 - 5 kOhm) in addition to exponential dependence of electric conductivity plotted as a function of inverse temperature having activation energy 0.03 - 0.5 eV, which coincides with ionization energy of shallow dope levels. The same value is obtained from measurements of the temperature dependence of the Hall constant [46]. 

Fig. 10.20 Values of the ratio g=N(EF)/N(EF)frcc for metal-ammonia solutions deduced from Knight shift (k), conductivity (c) and Hall constant (h). (Data provided by Dr J. V. Acrivos Hall data from Nasby and Thompson (1970) and Vanderhoff and...

Harrison found essentially the same results using single crystals and sintered samples. The slopes of the logarithms of the Hall constant and conductivity plotted against inverse absolute temperature were practically identical. The mobility varied in magnitude from sample to sample, but not in temperature dependence. Little time dependence of the conductivity was observed and none for the Hall coefficient. 

As was discussed above, the absence of a kink in the nodal band below Ev [11] in NCCO, supports the possibility that it is also a real n-type cuprate. It is possible that the change in the sign of the TEP slope in NCCO with doping is an anomalous band-structure effect, probably associated with the peculiar evolution of its FS with doping, detected in ARPES [34], The position of the kink (below or above /q.) is determined by the inequality (11) between dq+ and d L, which is less susceptible to band-structure effects than the inequality (11) between bq+ and bq, determining the sign of the TEP slope. Anomalous behavior is observed also in the Hall constant of NCCO [32], which changes... 

The sign of the Hall constant indicates whether the charge carriers... 

The Hall effect has been measured in some organic conductors. As far as (TMTSF)2C104 is concerned, the low-field Hall constant measured at low temperature is small and positive (holes) in fair agreement with the value derived from the kinetic theory of the Hall constant for a one-... 

These results may be interpreted on the basis of the band model for graphite J 9, 88). Because of the loss of electrons during the oxidation, holes are produced in the low er almost eompletely occupied band of graphite and as a result the number of charge carriers increases. Since this occurs predominantly in the lower band, the Hall constant is positive. Graphite bisulfate is thus a conductor of the p-type. 

As indicated in an earlier review," the Hall effect has been the subject of numerous investigations. The Hall constant Rjj is defined by the classical electric field equation... 

The preparation and electrical properties of magnesium mercury, MgjHgj, have been reported. The intermetallic compound was prepared by heating the elements together above 562 °C, at which temperature the compound melts, in an evacuated silica tube. Electrical resistivity and Hall-effect measurements were made from 2.4 to 297 K. No phase transition was observed over this range. The Hall constant was low and the ideal resistivity (the difference between total and residual resistivity) had the form p a T , where a = 1.9 and 1.0 at 11.50K and... 

Changes in the electronic properties of the layered metal dichalcogenides after intercalation may be investigated by measurements, for example, of the optical absorption spectra, electrical conductivity. Hall constant, magnetic susceptibility, and solid-state NMR spectra. In general, these measurements provide evidence for our premise of charge transfer from the intercalant to the host lattice. 

The Hall mobility. In conventional semiconductors p differs from Pc by a factor of order unity that depends on the detailed band structure of the material. This factor a also appears in the Hall constant ... 

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