
VOLUME 72  ISSUE 3 
PAGE 205

Does the "quantized nesting model" properly describe the magneticfieldinduced spindensitywave transitions?
Lebed A.G.
PACS: 71.70.Kn
Theoretical reinvestigation of a socalled fieldinduced spindensitywave (FISDW) phase diagram in a magnetic field in quasionedimensional compounds (TMTSF)jX (X=PFe, уа4, AsFe, etc.) has revealed some novel qualitative features. Among them, axe: 1) the FISDW wave vector is never strictly quantized; 2) the FISDW phase diagram consists of two regions: a) "Quantum FISDW", where there exist jumps of the FISDW wave vectors between different FISDWsubphases, b) "Quasiclassical FISDW", where the jumps disappear above some critical points and only one FISDW phase (characterizing by a wave vector oscillating with a magnetic field) exists. Both these features are due to taking account of a breaking of an electronhole symmetry. They contradict to the previous textbook theoretical results (including the calculations of the "Three Dimensional Quantum Hall Effect") performed by means of the "Quantized Nesting Model" which explicitly assumes the existence of the electronhole symmetry. We stress that some effects related to the phenomena described above were experimentally observed but were not properly interpreted.

