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用振动样品磁强计和提拉法在1.5K≤T≤300K温度范围内系统测量了组分为0.03≤x≤0.45的Cd_(1-x)Mn_xS稀磁半导体单晶样品的磁化率.磁化率测量表明在高温区服从居里-外斯定律。从定量分析得到Mn~(++)离子间交换积分常数值.低场磁化率与温度变化规律(最低温度达1.5K)表明当样品x≤0.2时,体系仍然为顺磁态;而当样品组分x=0.3时,经零场冷却后磁化率在温度T_f处观测到一个尖峰,对x>0.3样品亦得到类似结果,只是磁化率在不同冻结温度T_f处对应一个较宽的峰。这些结果说明在低温区发生从顺磁态到自旋玻璃态的相变.文中给出Cd_(1-x)Mn_sS的磁相图并对此作了讨论.
The magnetic susceptibility of Cd_ (1-x) Mn_xS diluted magnetic semiconductor single crystal samples with composition of 0.03≤x≤0.45 was systematically measured by using vibrating sample magnetometer and Czochralski method in the temperature range of 1.5K≤T≤300K. Rate measurements show that Curie-Viese’s law is obeyed at high temperatures. The integral constants of exchange between Mn ~ (+ +) ions were obtained from the quantitative analysis. The law of low field susceptibility and temperature (the minimum temperature reached 1.5K) indicated that the system remained paramagnetic when the sample was x≤0.2. When component x = 0.3, a sharp peak was observed at temperature T_f after zero-field cooling. Similar results were obtained for x> 0.3 samples except that the magnetic susceptibility corresponded to a wider peak at different freezing temperatures T_f. These results indicate that the phase transition from paramagnetism to the spin-glass state takes place in the low temperature region, and the magnetic phase diagram of Cd_ (1-x) Mn_sS is given and discussed.