| Numéro |
J. Phys. Colloques
Volume 39, Numéro C6, Août 1978
The XVth International Conference on low temperature physicsQuantum Fluids and Solids Superconductivity |
|
|---|---|---|
| Page(s) | C6-1106 - C6-1107 | |
| DOI | https://doi.org/10.1051/jphyscol:19786490 | |
Quantum Fluids and Solids
Superconductivity
J. Phys. Colloques 39 (1978) C6-1106-C6-1107
DOI: 10.1051/jphyscol:19786490
THE CHANGE OF THE CONNECTIV1TY OF Bi ELECTRON FERMI SURFACE UNDER PRESSURE
N.B. Brandt, V.V. Moshalkov and S.M. ChudinovLow Temperature Laboratory, Physics Department, Moscow State University, USSR
Résumé
On a établi que sous l'influence de la pression hydrostatique la surface de Fermi des électrons (FSE) du bismuth passe d'une forme quasi ellipsoïdale à celle d'une "poignée". Le "col" des poignées diminue sous la pression et on observe la rupture de FSE en deux surfaces isolées induite par un champ magnétique élevé. On a démontré que le rapport des paramètres de la loi de dispersion de McClure Q222/ αv, est inférieur à 0,0005 unités atomiques.
Abstract
The transition of the Bi eletron Fermi surface (EFS) from ellipsoidal to dumb-bell shaped and then to a doubly connected shape under hydrostatic pressure has been established. For the pressure at interval, in which the "neck" cross-section becomes quite small, a change of the connectivity of the EFS induced by magnetic field is observed. The ratio Q222/ αv of McClure's dispersion law parameters has been found to be less than at least 0,0005 at.units.