New Type of Oscillations in InSb

概要

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Remarkable current oscinations, coherent and incoherent, have been observed in p-InSb at 77°Kin a transverse magnetic field. Fig. 1 shows a typical coherent oscillation. The samples used were p-InSb (carrier concentration; p〜___1O^<15>/cm^3. hole mobility; μ〜___8000cm^2/volt-sec.), whose shape was of rectangular bar or bridge, 3〜10mm long and 0.7〜1.2mm wide. Voltage pulses of 1 μsec and 4 μsec duration were applied at the repetition rate 10 c/sec. As the applied electric field increases up to about 300〜500 volt/cm, across-gap ionization occurs. Immediately after that, the voltage pulse shape exhibits a decay, indicating a decrease in the resistivity in the current direction, and the current begins to oscillate, coberently, or incoherently with frequencies 1O〜50Mc/sec. In some cases, a very large modulation rate was observed. The frequencies and the wave-forms of these oscillations were little affected by the extenal circuits, but varied with the magnitude of the magnetic field, which indicates that these phenomena have their origin in the body of the crystal. There is a critical value of the magnetic field for the current oscillation. No appreciable current oscillation appeared in the longitudinal magnetic field as well as in the absence of the magnetic field.
社団法人日本物理学会の論文
1964-02-05