The work is devoted to investigation of thermopower and magneto-thermopower in the longitudinal field in wires of pure Bi and Bi<Sn> alloys with concentrations of T-holes at 4.2K up to 3*10¹⁸ cm^-3. The diameters of wires changes from 100 nm to 3mkm.
Bi and Bi<Sn> nanowires (in glass cower) were fabrication by casting method from liquid phase. All wires had one the same orientation - wire axis make up and angle of 20⁰ with the bisector axis C_S in the bisector trigonal plane.
Peculiarities of thermopower and resistance behavior caused by electron topological transitions (ETT) induced by stretch and doping are found. ETT were fixed by change of the Fermi surface cross-section detected by the ShdH oscillations on both resistance and thermopower.
On the temperature dependence of the thermopower of Bi wires with d< 1 mkm in the temperature range ~30-40 K the positive maximum is formed, its value depending on the wire diameter d. The thermopower decrease with the temperature lowering (<40 K) is caused by freezing of long-wave phonons with the energy 43 K and by increasing of degeneration of electron and hole gas. It is found that in the nondeformed state in wires d>300nm of pure and Sn-doped bismuth the phonon drag effect is absent, i.e. the thermopower is determined only by the diffusion processes.
Influence of the size of a sample (diameter and length), impurity of Sn, a magnetic field and an elastic elongation on Phonon drag effect in nanowires Bi and BiSn was investigated.
The work was supported by the Civilian Research Defense Corporation, CGP- grant # MO-E1-2603-SI-04.

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1. Conductivity in quantum wires in a homogeneous magnetic field