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Magnetization and electrical resistivity of α-Sm2S3 have been investigated by using single crystals. The temperature dependence of the magnetization; M(T), demonstrates a magnetic transition at around T = 4.5 K. The M(T) shows abrupt rise below 5K with decreasing temperature in the low magnetic filed of H = 100 Oe. Zero-field-cooled M(T) shows a sudden decrease with marking a maximum at 4.5 K, while field-cooled M(T) keeps steady rising around this temperature. The magnetization M(H) in the magnetic field along the c-axis shows a ferromagnetic hysteresis at the lower temperature than TC = 4.5 K, although its magnitude is much smaller than the value for the full Sm3+ moment. The resistivity ρ(T) indicates a double peak having the maxima at T = 4.65 and 3.3 K in no magnetic field. The ratio of ρ(4.65 K) to ρ(6.0 K) is extremely large as it exceeds 100. The double peak diminishes rapidly with increasing magnetic field. The negative giant magneto-resistance effect having the magneto-resistance ratio of −99 % at H = 10 kOe has been observed at T = 4.5 K.

Drastic change of the electrical resistivity related to the novel magnetic phase transition in α-Sm2S3

Drastic change of the electrical resistivity related to the novel magnetic phase transition in α-Sm₂S₃