Magnetic Phase Diagram and Field Induced Magnetic Structure in DyCo_2Si_2

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The H-T magnetic phase diagram and field induced magnetic structure in tetragonal DyCo_2Si_2 with a two-step metamagnetic process have been determined by magnetization and neutron diffraction experiments using a single crystal as well as specific heat experiment on a polycrystalline sample. Three magnetic phases exist be-low T_N=23 K. A simple antiferromagnetic structure (phase I), with the propagation vector Q_1=(0, 0, 1) and moments along the c-axis, is stable below 21 K under low field. The intermediate field induced magnetic structure (phase II) is characterized by two additional propagation vectors : i) Q_0=(0, 0, 0) and ii) Q_2=(1/2, 1/2, 1/2) which is a sub-harmonics of (1, 1, 1)(≡Q_1) and consists of ferromagnetic (111) planes with the sequence of + + + - . It has a resultant magnetization of half the saturation value, i.e. 5.0μ_B/f.u., at low temperature. Between T_N and 21K, an antiferromagnetic phase (phase III) with an unknown structure appears.
社団法人日本物理学会の論文
1994-07-15