Magnetic and structural properties of Mn1.8Co0.2Sb under high magnetic fields

Hiroki Orihashi, Masahiko Hiroi, Yoshifuru Mitsui, Kohki Takahashi, Kazuo Watanabe, Kazuyuki Matsubayashi, Yoshiya Uwatoko, Keiichi Koyama

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Magnetization, electrical resistivity and X-ray diffraction measurements were carried out for Mn1.8Co0.2Sb with a tetragonal structure in 4.2 ≤ T ≤ 280K and in field B up to 16 T. For B = 0 T, anisotropic structural deformation occurred at Tt ∼ 140K for zero-field cooling (ZFC), accompanied by a first-order magnetic transition from the ferrimagnetic (FRI) to antiferromagnetic (AFM) phases. In this deformation, the lattice parameters a and c changed by δ a/a=+0.15% and by δ c/c = -0.44%, respectively. By applying magnetic fields of 5 T, Tt decreased to 60K with thermal hysteresis of 35 K. The two-phase coexistence of the AFM and residual FRI phases was observed even at 10K for field cooling of 5 T, while a single phase of AFM was confirmed for ZFC. At B = 16 T, the transition did not occurs. In addition, a field-induced structural deformation was observed, accompanied by the metamagnetic transition just below Tt. The obtained results are discussed from a viewpoint on entropy change for the transition.

Original languageEnglish
Pages (from-to)969-973
Number of pages5
JournalMaterials Transactions
Volume54
Issue number6
DOIs
Publication statusPublished - 2013 Jun 18

Keywords

  • First order transition
  • High magnetic field
  • MnSb
  • X-ray powder diffraction

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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