High Magnetic Field Range Research Articles

Longitudinal Magnetophonon Resonance inn-Type InP in Ohmic and Hot Electron Region

Longitudinal magnetophonon resonance in epitaxially grown n-type InP was studied in Ohmic and hot electron conditions using pulsed high magnetic fields up to 30 T. In the temperature range between 140 and 240 K, it was found that in the Ohmic region the longitudinal magnetophonon peaks with integer harmonic numbers showed a considerable phase shift whereas those with half-integer harmonic numbers are in good agreement with the theoretically predicted positions. In hot electron conditions at low temperatures 10-40 K, new structure was observed in high magnetic field range.

Shubnikov-de Haas Effect in Si MOS–FET in High Magnetic Fields up to 37 T

Shubnikov-de Haas oscillations were observed for n -channel (100) Si MOS–FETs in pulsed high magnetic fields up to 37 T. Magnetic field dependence of the peak height of the transverse conductivity σ x x associated with the N =0 Landau level was investigated at various magnitudes of source-drain field at 1.9 K. In high magnetic field range, it was found that the height of the first of the four N =0 peaks increased with increasing magnetic field when the source-drain field was relatively low. Similar increase of the peak height by magnetic field was also observed for the other three peaks. The number of immobile electrons in the lowest Landau level was also estimated, and it was found to increase as the magnetic field was increased. In addition, fine structures were observed between the gaps of the conductivity peaks.