Effect of Random Fields on the Phase Diagram of the Diluted Antiferromagnet Mn_<0.80>Mg_<0.20>TiO_3 in the Field-Temperature Plane

概要

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The diluted antiferromagnet Mn_<0.80>Mg_<0.20>TiO_3 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 Mn_<0.75>Zn_<0.25>F_2 where the behavior of the spin system is suggested to be anomalous by Cowley et al. (Z. Phys. B 75 (1989)303).
社団法人日本物理学会の論文
1995-12-15