Effect of Random Fields on the Phase Diagram of the Diluted Antiferromagnet Mn<sub>0.80</sub>Mg<sub>0.20</sub>TiO<sub>3</sub>in the Field-Temperature Plane

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  • Fukaya Atsuko
    The Doctoral Research Course in Human Culture, Ochanomizu University, Bunkyo–ku, Tokyo 112
  • Ito Atsuko
    Faculty of Science, Ochanomizu University, Bunkyo–ku, Tokyo 112
  • Katori Hiroko Aruga
    Institute for Solid State Physics, University of Tokyo, Minato–ku, Tokyo 106
  • Goto Tsuneaki
    Institute for Solid State Physics, University of Tokyo, Minato–ku, Tokyo 106

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  • Effect of Random Fields on the Phase Diagram of the Diluted Antiferromagnet Mn0.80Mg0.20TiO3 in the Field-Temperature Plane.
  • Effect of Random Fields on the Phase Di

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The diluted antiferromagnet Mn0.80Mg0.20TiO3 has been studied by measuring magnetization processes and temperature variations of magnetization, and the magnetic phase diagram in the field-temperature (H-T) plane has been determined. It is demonstrated that the existence of random fields strongly affects the phase transitions. The most noteworthy result is that the H-T phase diagram consists of four phases instead of the generally known three phases: a paramagnetic, an antiferromagnetic and a spin-flop phase. We propose that the fourth phase corresponds to the region in the H-T phase diagram of Mn0.75Zn0.25F2 where the behavior of the spin system is suggested to be anomalous by Cowley et al. (Z. Phys. B 75 (1989) 303).

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