Effect of the mutual dragging of electrons and phonons on the thermomagnetic effects in HgSe

The longitudinal and transverse Nernst-Ettingshausen (NE) effects were measured in HgSe samples doped with various concentrations of gallium, 0.6×10¹⁸<N(Ga)<4.7×10¹⁸ cm^?3. The NE measurements were performed for the classical interval of magnetic field strengths (0–40 kOe) in the temperature range from 20 to 60 K. It was established that the low-temperature NE coefficients change sign with increasing Ga concentration or the applied magnetic field strength. It is shown that all unusual features of the NE effects observed in HgSe crystals can be attributed to the effect of mutual dragging of electrons and phonons. This implies that the effect of mutual electron-phonon dragging can be experimentally detected in semiconductors with high concentration of conduction electrons.     

Stability of discrete-time systems in the simplest critical case

The paper considers nonlinear time-invariant discrete-time systems of arbitrary orders. The right-hand sides of the equations are sums of polynomials of arbitrary degrees and continuous functions which are infinitely small with respect to the highest-degree terms of the polynomials. It is assumed that the characteristic polynomial of the linearized system has one root equal to unity, while its other roots lie inside the unit disk.     

The study of the thermal dissociation processes of compounds of the type MoO2(C6H5CONHO)2.nA

Thermal dissociation processes of compounds with the composition MoO₂(C₆H₅CONHO)₂.nA (A-polar organic solvent: alcohols, aldehydes, ketones, organic acids) were investigated. Kinetics of dissociation was studied in a flow reactor, the values of activation energy and preexponential factor were calculated. The influence of a solvent nature, of the length of included molecules and of the type of crystalline lattice was studied. The sequence of kinetic stability was obtained. It corresponds to the sequence of solvent activity with respect to H-binding up with the complex. For the series of alcohols nonmonotonous dependence of kinetic parameters on the length of chain (with the division into two groups: with even and oddn) was obtained. For all the compounds studied a compensation relationship is observed (lgA=aE+b).

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Zusammenfassung Es wurden thermische DissoziationsvorgÄnge von Verbindungen der Zusammensetzung MoO₂(C₆H₅CONHO)₂ nA (mitA=polares organisches Lösungsmittel: Alkohole, Aldehyde, Ketone, organische SÄuren) untersucht. Die Dissoziationskinetik wurde in einem Durchlaufreaktor untersucht, die Werte für Aktivierungsenergie und prÄexponentiellen Faktor berechnet. Es wurde weiterhin der Einflu\ von der Art des Lösungsmittels, von der LÄnge der beteiligten Moleküle und vom Kristallgittertyp untersucht sowie eine Reihenfolge bezüglich der kinetischen StabilitÄt ermittelt. Diese stimmt mit der Reihenfolge der LösungsmittelaktivitÄt bezüglich der H-Bindung zum Komplex überein. Für die Alkoholreihen (zwei Reihen: mit geradem bzw. ungerademn) wurde keine sich monoton mit der analogen Reihe verÄndernde AbhÄngigkeit der kinetischen Parameter von der KettenlÄnge beobachtet. Für alle untersuchten Verbindungen wurde eine Kompensationsgleichung (lgA=aE+b) beobachtet.