ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 49, (1) 1 - 6 (2005)

Hondou Katsuhiro 3, Usuda Manabu 2, Iio Katsunori 1
1 Dept. of Phys., Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
2 Synchrotron Radiation Rearch Center, Japan Atomic Energy Research Institute, Spring-8, Mikazuki, Hyogo 679-5148, Japan
3 Shiga International Patent Office, 2-3-1 Yaesu, Chuo-ku, Tokyo 104-8453, Japan

Keywords: Magnetic susceptibility, Electric resistivit, Chalcogenide, (NiS4) Square plane, Kagome lattice

The influence of water-immersing on the magnetic behavior of Rb₂Ni₃S₄ single crystals grown by the flux method was studied, where the intrinsic substance is non-magnetic because of the low spin state of Ni²⁺ in a Kagome lattice. The influence of Codoping to Rb₂Ni₃S₄ was also studied in terms of the local spin density approximation (LSDA) band structure calculation. Residual ferromagnetic moments appeared in specimens immersed into water, as their magnitudes increase depending on the immersion time. The LSDA band structure calculation suggested that Co substitution for Ni allows deriving a novel ferromagnetic behavior.

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