Atomic Order Along the Half- to Full-Heusler Transition in Ni1+xMnSb

Pascal Neibecker, Xiao Xu, David Simonne, Lucas Hollender, Florence Porcher, Anatoliy Senyshyn, Toshihiro Omori, Ryosuke Kainuma, Winfried Petry, Michael Leitner

Research output: Contribution to journalArticlepeer-review

Abstract

Structural voids are a defining feature of the half-Heusler structure. Using temperature-dependent neutron diffraction, complemented by room-temperature X-ray diffraction and high-resolution neutron diffraction as well as calorimetry and macroscopic magnetization measurements, the disordering of these vacancies is followed across the Clb–L21 transition in samples of (Formula presented.) for various Ni excesses x. The thermal vacancy concentration increases toward high temperatures, and excess vacancy concentrations large enough to increase the low-temperature macroscopic magnetization can be retained by quenching. Finally, the consequences of the strongly differing relaxation rates of order and vacancy concentrations are demonstrated, showing that in these and related systems the thermal history potentially determines material properties such as ordering temperatures much more strongly than usually.

Original languageEnglish
JournalPhysica Status Solidi (B) Basic Research
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • NiMnSb
  • constitutional vacancies
  • half-Heusler
  • neutron diffraction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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