Striped-type superstructure in -brass alloys

Yasumasa Koyama, J. Yoshida, H. Hoshiya, Y. Nakamura

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The striped-type superstructure in the -brass phase has been investigated both experimentally and theoretically. Electron microscopy observation shows that, in addition to the existence of the striped pattern of the striped-type superstructure, the so-called jellyfish pattern consists of three inversion domains belonging to one of two types. The analysis of the electron-diffraction pattern further leads to an important conclusion that the striped-type superstructure can be interpreted as a structure of the normal -brass type modulated by two incommensurate waves. On the basis of the experimental results, the electronic origin and the discommensurate structure of the striped-type superstructure are discussed. First, the relation between the Fermi surface and the repeated Brillouin zone indicates that the two incommensurate waves have wave vectors determined as a spanning vector of the flat portion of the Fermi surface. Secondly, the Ginzburg-Landau-type model, whose order parameter is the charge density due to the charge density waves, is proposed, and reproduces the experimentally obtained change in the period of the striped-type superstructure. It is also shown that there is a phase slip of 2/3 across the discommensuration. These features derived based on the model are entirely consistent with those observed experimentally. Accordingly, it is concluded that the striped-type superstructure in the -brass phase can be interpreted as the charge-density-wave state in the three-dimensional system.

Original languageEnglish
Pages (from-to)5378-5386
Number of pages9
JournalPhysical Review B
Volume40
Issue number8
DOIs
Publication statusPublished - 1989
Externally publishedYes

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brasses
Brass
Charge density waves
Fermi surface
Fermi surfaces
Charge density
Electron diffraction
Diffraction patterns
Electron microscopy
Brillouin zones
electron microscopy
slip
diffraction patterns
electron diffraction
brass
inversions
electronics

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Striped-type superstructure in -brass alloys. / Koyama, Yasumasa; Yoshida, J.; Hoshiya, H.; Nakamura, Y.

In: Physical Review B, Vol. 40, No. 8, 1989, p. 5378-5386.

Research output: Contribution to journalArticle

Koyama, Y, Yoshida, J, Hoshiya, H & Nakamura, Y 1989, 'Striped-type superstructure in -brass alloys', Physical Review B, vol. 40, no. 8, pp. 5378-5386. https://doi.org/10.1103/PhysRevB.40.5378
Koyama, Yasumasa ; Yoshida, J. ; Hoshiya, H. ; Nakamura, Y. / Striped-type superstructure in -brass alloys. In: Physical Review B. 1989 ; Vol. 40, No. 8. pp. 5378-5386.
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