采用固相反应法,制备出一系列SmCo1-xFexAsO (x=0,0.05,0.1,0.2)多晶样品.XRD测试结果表明所有样品均为单相,且具有ZrCuSiAs型四方结构,随着掺杂量的增加,晶格参数a逐渐减小,c逐渐增加.磁性测量结果表明,低掺杂量样品在5 ～ 300 K之间先后经历了反铁磁-铁磁-顺磁的磁性转变,低场下的M-T曲线表现出明显的不可逆性,且随着掺杂量的增加,反铁磁转变温度降低,铁磁转变温度向高温方向移动,表明样品的反铁磁性逐渐被抑制,而铁磁性逐渐增强.M-H曲线表明,在反铁磁转变温度以下,掺杂量x＜0.2的样品,随着磁场的增加发生了由反铁磁到铁磁性的变磁性转变,且随着掺杂量的增加,在同一温度下的转变磁场变小.在掺杂量x=0.2时,当温度降低到5K时仍没有观察到变磁性转变,在掺杂量x=0.2附近可能存在变磁性临界终点.
参考文献
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