Drastic change in density of states upon martensitic phase transition for metamagnetic shape memory alloy Ni2Mn1+xIn1-x

Siyuan Zhu, Mao Ye, Kaito Shirai, Masaki Taniguchi, Shigenori Ueda, Yoshio Miura, Masafumi Shirai, Rie Yamauchi Umetsu, Ryosuke Kainuma, Takeshi Kanomata, Akio Kimura

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

We have unravelled the electronic structure of a class of metamagnetic shape memory alloy Ni2Mn1+xIn1-x by combining bulk-sensitive hard x-ray photoelectron spectroscopy and first-principles density-functional calculations. A sharp drop in the Ni 3d density of states forming a pseudogap in the martensitic phase transition (MPT) for x = 0.36 has been observed near the Fermi level. As a feature of MPT, hysteretic behaviour of this drop has been confirmed in both cooling and warming. This pseudogap is responsible for the giant negative magnetoresistance. The experimental result is well reproduced by the first principle calculation. We have also clarified theoretically that the MPT is linked to a competition of ferromagnetic and anti-ferromagnetic coupling between ordinary and anti-site Mn atoms.

Original languageEnglish
Article number362201
JournalJournal of Physics Condensed Matter
Volume27
Issue number36
DOIs
Publication statusPublished - 2015 Sep 16

Keywords

  • density of states
  • martensitic phase transition
  • photoelectron spectroscopy

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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