Structure of amorphous Cu2GeTe3 and the implications for its phase-change properties

Jens R. Stellhorn*, Benedict Paulus, Shinya Hosokawa, Wolf Christian Pilgrim, Nathalie Boudet, Nils Blanc, Hiroyuki Ikemoto, Shinji Kohara, Yuji Sutou

*この論文の責任著者

研究成果: ジャーナルへの寄稿学術論文査読

12 被引用数 (Scopus)

抄録

The structure of amorphous Cu2GeTe3 is investigated by a combination of anomalous X-ray scattering and extended X-ray absorption fine-structure experiments. The experimental data are analyzed with reverse Monte Carlo modeling, and they are interpreted in terms of short-range-order parameters as well as by using ring statistics and persistent homology to study the intermediate-range order. Based on this information, the structural relationship of the amorphous phase to the corresponding crystal is discussed. It is found that the amorphous network can be rationalized by small atomic displacements of the crystal structure, directed toward the intrinsic void regions. This structural similarity establishes the possibility of a fast phase-change process. On the other hand, the atomic rearrangements also lead to the formation of new chemical bonds and to distortions on the intermediate-range-order level. These are realized by a collapse and contraction of the strict hexagonal ring arrangements of the crystal and by the formation of small, triangular rings as well as Cu cluster configurations. These structural features allow for a new understanding of the phase-change property contrast of this material, especially concerning the density change and the optical contrast.

本文言語英語
論文番号214110
ジャーナルPhysical Review B
101
21
DOI
出版ステータス出版済み - 2020/06/01

ASJC Scopus 主題領域

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

フィンガープリント

「Structure of amorphous Cu2GeTe3 and the implications for its phase-change properties」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル