Large displacement of germanium atoms in crystalline Ge2 Sb2 Te5

S. Shamoto, N. Yamada, T. Matsunaga, Th Proffen, J. W. Richardson, Jaiho Chung, T. Egami

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Abstract

Local structure of NaCl-type crystalline Ge2 Sb2 Te5 has been studied by the atomic pair distribution function analysis of pulsed neutron powder diffraction data. We have found the large displacement of germanium atoms in this crystalline phase. Usually, such a large lattice distortion has disadvantages for the electric conductivity. The electronic band structure, however, implies that this significant distortion in addition to the lattice defect at Na site reduces only thermal conductivity, while the highly ordered tellurium atoms at Cl site keep high electric conductivity.

Original languageEnglish
Article number081904
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Volume86
Issue number8
DOIs
Publication statusPublished - 2005 Feb 21
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Shamoto, S., Yamada, N., Matsunaga, T., Proffen, T., Richardson, J. W., Chung, J., & Egami, T. (2005). Large displacement of germanium atoms in crystalline Ge2 Sb2 Te5. Applied Physics Letters, 86(8), 1-3. [081904]. https://doi.org/10.1063/1.1861976