| Dy(Fe0.8Al0.2)2单晶体的宏观量子效应 |
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| 引用本文： | 钟文定,陈海英,刘尊孝,吴建华,李国忠.Dy(Fe0.8Al0.2)2单晶体的宏观量子效应[J].物理学报,1999,48(13):204-210. |
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| 作者姓名： | 钟文定 陈海英 刘尊孝 吴建华 李国忠 |
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| 作者单位： | 北京大学物理系，北京 100871 |
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| 基金项目： | 国家自然科学基金（批准号：19674002）资助的课题. |
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| 摘 要： | 测量了Dy(Fe0.8Al0.2)2单晶体在100],110]和111]方向上的退磁曲线、内禀矫顽力和磁黏滞性系数随温度的变化.认为退磁曲线出现台阶和大跳跃、内禀矫顽力随温度变化存在峰值、磁黏滞性系数与温度无关等都是畴壁隧穿能垒的宏观量子效应的反映.实验上得出由经典热激活到量子隧穿的交界温度约为5.5K.
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| 收稿时间： | 1999-07-26 |
Macroscopic Quantum Effects in Single Crystal Dy (Fe0.8Al0.2)2 |
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| Zhong Wen-Ding,Chen Hai-Ying,Liu Zun-Xiao,Wu Jian-Hua and Li Guo-Zhong.Macroscopic Quantum Effects in Single Crystal Dy (Fe0.8Al0.2)2[J].Acta Physica Sinica,1999,48(13):204-210. |
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| Authors: | Zhong Wen-Ding Chen Hai-Ying Liu Zun-Xiao Wu Jian-Hua and Li Guo-Zhong |
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| Abstract: | The temperature dependence of demagnetization curve, intrinsic coercivity and magnetic viscosity has been measured on single crystal Dy (Fe0.8Al0.2)2 in 100], 110] and 111] directions. The staircase and a large jump of demagnetization curve, an obvious peak of coercivity vs temperature, and the magnetic viscosity being independent of the temperature etc., were observed. The observed features were analyzed within the theory of the macroscopic quantum effects for domain walls tunneling in the single crystal. A crossover temperature has been observed at Tcr=5.5K between classical thermal activation and quantum tunneling regimes. |
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