Fizika Nizkikh Temperatur: Volume 25, Number 8-9 (August 1999), p. 903-909 ( to contents , go back )
"High-temperature" oscillations of bismuth conductivity under ultra-quantum limit
Vit. B. Krasovitsky, V. V. Khotkevich,
B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47, Lenin Ave., 310164, Kharkov, Ukraine
A. G. M. Jansen and P. Wyder
Grenoble High Magnetic Field Laboratory Max-Plank Institut and Centre National de la Recherche Scientifique, B. P. 166, F-38042 Grenoble Cedex 9, France
(Received March 30, 1999 )
The results of joint researches of Shubnikov-de-Haas oscillations and "high-temperature" oscillations (HTO) of diagonal and non-diagonal components of a magnetoresistance tensor of pure bismuth in magnetic field of up to 20 T are represented. The oscillations are measured for magnetic field directions close to trigonal and binary crystallographic axes at temperatures 4-43 K. A consequence of the comparison between the modifications of the energy spectrum parameters of bismuth in the ultra-quantum limit and the HTO features is the fact that the HTO periods do correspond to the width of the region of overlap of energy bands. For the case where the easy electrons in two ellipsoids are in the ultra quantum limit, a correlation between the exist of the last Landau level of heavy electrons (i.e. the full closing of the third electronic ellipsoid) and the vanishing of the HTO periods is found out. This experimental fact may be a key for theoretical description of the nature of the HTO.