Magnetovolume effects of MnAs1−<i>x</i>Sb<i>x</i>

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  • O. Nashima
    Department of Applied Physics, Tohoku Gakuin University, Tagajo, 985, Japan
  • T. Suzuki
    Department of Applied Physics, Tohoku Gakuin University, Tagajo, 985, Japan
  • H. Ido
    Department of Applied Physics, Tohoku Gakuin University, Tagajo, 985, Japan
  • K. Kamishima
    Institute for Solid State Physics, University of Tokyo, Roppongi, Minato-ku, Tokyo, 106, Japan
  • T. Goto
    Institute for Solid State Physics, University of Tokyo, Roppongi, Minato-ku, Tokyo, 106, Japan

抄録

<jats:p>Thermal expansion, high-field magnetization, and susceptibility measurements have been made for MnAs0.7Sb0.3. The thermal expansion measurements show that the spontaneous magnetostriction is large and anisotropic below Tc. The spontaneous magnetostriction at 0 K is estimated to be 1.2×10−2 for a axis, −0.8×10−2 for c axis, and 1.6×10−2 for the volume. The spontaneous magnetization decreases sharply in the narrow temperature region below Tc=230 K. All the spontaneous magnetostrictions are found to be proportional to the square of spontaneous magnetization. The magnetization curves measured in a high field up to 40 T show the metamagnetic-like transitions at temperatures above Tc, and they are almost perfectly reproduced by an equation H=A1σ+A2σ3+A3σ5, where H is the applied field and σ is the relative magnetization.</jats:p>

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