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  • 1 Japan Advanced Institute of Science and Technology Center for New Materials Hokuriku 1-1 Asahidai Tatsunokuchi, Ishikawa 923-1292 Japan Hokuriku 1-1 Asahidai Tatsunokuchi, Ishikawa 923-1292 Japan
  • | 2 Noritake Co., Limited Miyoshi Development Department, Research and Development Division Aichi 470-0293 Japan Aichi 470-0293 Japan
  • | 3 Osaka University Microcalorimetry Research Center, School of Science Toyonaka, Osaka 560-0043 Japan Toyonaka, Osaka 560-0043 Japan
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Abstract  

The heat capacities and magnetic susceptibilities of powdered samples of FexNbS2 (x=0.14, 0.21 and 0.30) were measured at temperatures from 8 to 303 K and from 5 to 300 K, respectively. For Fe0.14NbS2, the magnetic susceptibility exhibited an anomaly as a shoulder at about 57 K, but no heat capacity anomaly was observed at this temperature, indicating the appearance of a spin-glass state. Anomalies in the heat capacity for FexNbS2 (x=0.21 and 0.30) occurred at 100.5 and 45.0 K, respectively, where the magnetic susceptibility displayed a maximum, corresponding to an antiferro-paramagnetic phase transition. The electronic state of the iron atom is discussed on the basis of entropy analysis.