Cyclotron resonance of electrons in silicon at temperatures up to 200  K

Cyclotron resonance signals from thermally generated electrons have been observed with ultra-high purity silicon samples over the temperature range 50-206 °K. A microwave spectrometer incorporating a confocal cavity and operating at a frequency of 139 Gc/s was used in these experiments. The transverse effective mass parameter m ⊥ is found to increase with temperature by 6±3% at 102 °K. The longitudinal mass m || appears to be unaffected by any temperature change. The collision times derived from the width of the resonance lines are in good agreement with mobility data in this temperature range. However, the collision time anisotropy ratio for intravalley acoustic phonon scattering (<τ || >/<τ ⊥ >) was found to be 0.90 +0.05 -0 11 in disagreement with magnetoresistance measurements which suggest a value of 0 67. The following values for the deformation potential constants are derived from the cyclotron resonance data: Ξ u = 8.6 eV, Ξ d = -3.4 eV. A comparison of the deformation potentials quoted above with those derived from the magnetoresistance experiments shows that the cyclotron resonance data give better agreement with the recent theoretical calculations of Goroff and Kleinman. The origin of the above discrepancy is obscure.