Temperature- and field-induced first-order ferromagnetic transitions in MnFe(P1-xGex)

Hisato Yabuta, Kazunori Umeo, Toshiro Takabatake, Keiichi Koyama, Kazuo Watanabe

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

We have found that the hexagonal ZrNiAl-type compounds MnFe(P 1-xGex) with x = 0.15 and 0.17 show temperature- and field-induced first-order paramagnetic-to-ferromagnetic transitions with remarkable hysteresis loops at TC ≃ 250 K. The hysteresis widths in both temperature and field are much larger than those for a similar system of MnFe(P,As). On cooling below TC, the hexagonal lattice of MnFe(P1-xGex) contracts by 1.5% along the a-axis and elongates by 2.8% along the c-axis, keeping the crystal symmetry unchanged. The very small volume expansion of less than 0.1% suggests that the first-order transition is related to the anisotropic lattice distortion rather than the volume change.

Original languageEnglish
Article number113707
Journaljournal of the physical society of japan
Volume75
Issue number11
DOIs
Publication statusPublished - 2006 Nov

Keywords

  • First-order transition
  • Magnetocaloric effect
  • Metamagnetism
  • MnFe(P,AS)

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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