Magnetic properties of the spinel-type |
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Authors: | F Kariya K Ebina K Hasegawa K Koshimizu B Wuritunasitu K Hondou S Ebisu S Nagata |
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Institution: | aDepartment of Materials Science and Engineering, Muroran Institute of Technology, 27-1 Mizumoto-cho, Muroran, Hokkaido 050-8585, Japan |
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Abstract: | The spinel sulphide CuCr2S4 is a metallic ferromagnet with a Curie temperature , while CuHf2S4 has no magnetic anomaly. Magnetic properties of the quaternary spinel-type Cu(Cr1-xHfx)2S4 system have been studied. With increasing x the ferromagnetic properties are weakened gradually from a predominant ferromagnetic, a spin-glass, finally to a simple paramagnetic behavior. For the composition of x 0.50, a re-entrant spin-glass phase could emerge, even though the Curie temperature is ill-defined as a ferromagnetic phase boundary. Specimens with x≥0.90 remain paramagnetic down to 4.2 K. A spin crossover phenomenon is found around 160 K in the specimens of x=0.50–0.70. A step-like anomaly is manifestly detected in the magnetization, which corresponds with the change of the spin state. This crossover indicates that the spin state converts from high temperature S=2 into low temperature states. In the ordered states in , the magnetic moment originates from only Cr3+ ions. |
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Keywords: | Spinel-type color:black" href="/science?_ob=MathURL&_method=retrieve&_udi=B6WM2-4W9XBM0-4&_mathId=mml84&_user=10&_cdi=6922&_rdoc=6&_acct=C000054348&_version=1&_userid=3837164&md5=470b2d250a64fe39efd09694f69b77f8" title="Click to view the MathML source" Cu(Cr1-xHfx)2S4" target="_blank">alt="Click to view the MathML source">Cu(Cr1-xHfx)2S4 Sulfides Magnetic properties Spin-glass Spin-crossover phenomenon |
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