A New Type of Oscillations in Germanium under the Magnetic Field

• Published in: Japanese Journal of Applied Physics Vol. 3; no. 2; p. 72
• Main Authors: Komatsubara, Kiichi, Takasugi, Noboru, Kurono, Hirokazu
• Format: Journal Article
• Language: English
• Published: 01.02.1964
• ISSN: 0021-4922; 1347-4065
• DOI: 10.1143/JJAP.3.72

A negative resistance characteristics is observed in compensated germanium at liquid helium temperature. The sustaining field strength is changed by the transverse magnetic field. A new type of oscillation phenomenon is observed at the sustaining region when a magnetic field over a critical value is applied. Samples were prepared from highly compensated germanium single crystal and shaped in a form of rectangular bars. The oscillation frequency, w , is dependent on the crystal orientation with respect to the magnetic field and the current directions. The empirical formula relating the oscillation frequency to the cross section of a sample, L 2 , a magnetic field strength, H , and a majority impurity concentration, N m , is given by ω∝\frac{N{_{m}}^{1/3}H}{L^{2}}∼\frac{H}{r_{m}L^{2}} where r m is the mean separation of a majority impurity atoms.