High-T C ferromagnetic semiconductor-like behavior and unusual electrical properties in compounds with a 2× 2× 2 superstructure of the half-heusler phase

Ding Bang Xiong, Norihiko L. Okamoto, Takeshi Waki, Yufeng Zhao, Kyosuke Kishida, Haruyuki Inui

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Heusler phases, including the full- and half-Heusler families, represent an outstanding class of multifunctional materials on account of their great tunability in compositions, valence electron counts (VEC), and properties. Here we demonstrate a systematic design of a series of new compounds with a 2× 2× 2 superstructure of the half-Heusler unit cell in X-Y-Z (X=Fe, Ru, Co, Rh, Ir; Y=Zn, Mn; Z=Sn, Sb) systems. Their structures were solved by using both powder and single-crystal X-ray diffraction, and also directly observed by using high-angle annular dark-field imaging in a scanning transmission electron microscope (HAADF-STEM). The VEC values of these new compounds span a wide and continuous range comparable to those for the full- and half-Heusler families, thereby implying tunability in compositions and physical properties in the superstructure. In fact, we observed abnormal electrical properties and a ferromagnetic semiconductor-like behavior with a high and tunable Curie temperature in these superstructures. Doing things by halves: A series of new compounds that crystallize in the 2× 2× 2 superstructure of the half-Heusler phase have been obtained (see figure). In these new compounds, abnormal electrical properties and a ferromagnetic semiconductor-like behavior above room temperature have been observed.

Original languageEnglish
Pages (from-to)2536-2542
Number of pages7
JournalChemistry - A European Journal
Volume18
Issue number9
DOIs
Publication statusPublished - 2012 Feb 27
Externally publishedYes

Keywords

  • Heusler phase
  • electronic structure
  • magnetic properties
  • spintronics
  • superstructures

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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