Lattice distortions in magnetic fields
Miguel A N Araujo; Miguel A N Araujo; Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, UK
Журнал:
Journal of Physics: Condensed Matter
Дата:
1996-09-09
Аннотация:
A study is made of the stability of the possible lattice structures which result from the magnetic-field-induced lattice deformation introduced by Araujo and Khmelnitskii. The deformed lattice may either be the result of a single distortion occurring along a particular direction or of a superposition of distortions in different directions. In a noninteracting electron model the energy variation of the electron system will determine which final lattice structure is the most stable. When electron interactions are considered in the Hartree approximation we find that the energy variation of the electron system alone will not determine which final structure is the most stable. The latter is then imposed by the lattice itself. If the distortion turns out to be unidirectional then the corresponding charge-density wave should be weakly pinned even in the absence of impurities.
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