Magnetic and Structural Properties of Mn<sub>1.8</sub>Co<sub>0.2</sub>Sb under High Magnetic Fields

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  • Orihashi Hiroki
    Graduate School of Science and Engineering, Kagoshima University
  • Hiroi Masahiko
    Graduate School of Science and Engineering, Kagoshima University
  • Mitsui Yoshifuru
    High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University
  • Takahashi Kohki
    High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University
  • Watanabe Kazuo
    High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University
  • Matsubayashi Kazuyuki
    Institute for Solid State Physics, The University of Tokyo
  • Uwatoko Yoshiya
    Institute for Solid State Physics, The University of Tokyo
  • Koyama Keiichi
    Graduate School of Science and Engineering, Kagoshima University

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Other Title
  • Magnetic and Structural Properties of Mn₁.₈Co₀.₂Sb under High Magnetic Fields

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Description

Magnetization, electrical resistivity and X-ray diffraction measurements were carried out for Mn1.8Co0.2Sb with a tetragonal structure in 4.2 ≤ T ≤ 280 K and in field B up to 16 T. For B = 0 T, anisotropic structural deformation occurred at Tt ∼ 140 K 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 Δa/a = +0.15% and by Δc/c = −0.44%, respectively. By applying magnetic fields of 5 T, Tt decreased to 60 K with thermal hysteresis of 35 K. The two-phase coexistence of the AFM and residual FRI phases was observed even at 10 K 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.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 54 (6), 969-973, 2013

    The Japan Institute of Metals and Materials

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