| 小粒子体系的自发磁化 |
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| 引用本文： | 孙继荣,沈中毅,刘勇,蒲富恪. 小粒子体系的自发磁化[J]. 物理学报, 1993, 42(1): 134-141 |
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| 作者姓名： | 孙继荣 沈中毅 刘勇 蒲富恪 |
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| 作者单位： | 中国科学院物理研究所,北京100080 |
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| 摘 要： | 从自旋波理论出发,通过直接求解Heisenberg模型,研究了低温下小粒子自旋体系的自发磁化规律。研究表明:极低温下自旋波被冻结;在任何温度范围内,Bloch T3/2定律都不再严格成立。同时,本文还给出了小粒子中自旋受激反转几率随位置的分布,指出低温下不存在运动明显剧烈的表面层。关键词：
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| 关 键 词： | 小粒子体系 自旋波 磁化 低温 |
| 收稿时间： | 1992-01-20 |
SPONTANEOUS MAGNETIZATION OF SMALL PARTICLE SPIN SYSTEM |
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| SUN JI-RONG,SHEN ZHONG-YI,LIU YONG and PU FU-KE. SPONTANEOUS MAGNETIZATION OF SMALL PARTICLE SPIN SYSTEM[J]. Acta Physica Sinica, 1993, 42(1): 134-141 |
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| Authors: | SUN JI-RONG SHEN ZHONG-YI LIU YONG PU FU-KE |
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| Abstract: | Based upon the spin wave theory, the spontaneous magnetization of small particle system at low temperatures is studied by means of solving the Heisenberg model directly. Investigations show that the spin waves are frozen out at ultra-low temperature, and the Bloch T3/2 law is no longer correct in any region of temperature. At the same time, the distribution of the probability for spins to be activated versus positions is obtained, which indicates that there exists no spin layers with obviously high probability to flip. |
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