| NiMnSb半金属材料的临界指数及临界特征 |
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| 引用本文： | 任尚坤,任吉林,宋凯.NiMnSb半金属材料的临界指数及临界特征[J].河南师范大学学报(自然科学版),2006,34(1):141-144. |
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| 作者姓名： | 任尚坤 任吉林 宋凯 |
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| 作者单位： | 南昌航空工业学院,测控工程系,南昌,330063 |
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| 基金项目： | 河南省教育厅自然科学基金 |
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| 摘 要： | 在不同磁场下根据磁化强度与温度的关系,测定和研究了半金属NiMnSb块体材料的临界指数,精确求得居里温度TC=731 K,磁化率临界指数γ=1.12和有序临界指数β=0.482.实验结果表明半金属NiMnSb材料的临界特征符合铁磁理论的平均场模型.
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| 关 键 词： | 临界指数 半金属 NiMnSb |
| 文章编号： | 1000-2367(2006)01-0141-04 |
| 收稿时间： | 2005-04-05 |
| 修稿时间： | 2005年4月5日 |
Critical Exponential Character of Half-metallic NiMnSb Materials |
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| REN Shang-kun,REN Ji-lin,SONG Kai.Critical Exponential Character of Half-metallic NiMnSb Materials[J].Journal of Henan Normal University(Natural Science),2006,34(1):141-144. |
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| Authors: | REN Shang-kun REN Ji-lin SONG Kai |
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| Institution: | Testing and Control Engineering Department, Nanchang Institute of Aeronautical Technology, Nanchang 330063,China |
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| Abstract: | Critical exponents of the NiMnSb bulk materials have been investigated by measuring the temperature dependence of magnetization at different magnetic field.The critical temperature has been more accurately obtained to be T_C = 731 K.The critical exponents of γ and β for the initial susceptibility χ~(-1)_0 = C_1(T-T_C)~γ and the spontaneous magnetization M_s = C_2(T_C-T)~β have been determined as 1.12 and 0.482,respectively,indicating that the ferromagnetism of NiMnSb can be fitted by mean field model. |
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| Keywords: | critical exponent Half-metallic NiMnSb |
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