| 金属间化合物RMn2Ge2(R=La,Pr,Nd,Sm,Gd,Tb和Y)中的自发磁相变 及相变时的磁弹性异常 |
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| 引用本文： | 郭光华,R.Z.LEVITIN.金属间化合物RMn2Ge2(R=La,Pr,Nd,Sm,Gd,Tb和Y)中的自发磁相变 及相变时的磁弹性异常[J].物理学报,2000,49(9):1838-1845. |
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| 作者姓名： | 郭光华 R.Z.LEVITIN |
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| 作者单位： | (1)Department of Physics,M.V.Lomonosov Moscow State University,119899 Moscow,Ru ssia; (2)中南工业大学应用物理与热能工程系，长沙 410083 |
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| 摘 要： | 在10—800K的温度范围内用X射线衍射方法测量了RMn2Ge2(R=La,Pr ,Nd,Sm,Gd,Tb和Y)的晶格常数与温度的变化关系.在各种类型的自发磁相变观察到晶格常数 的磁弹性异常现象.实验得出，自发磁相变时的磁弹性异常主要由Mn次晶格引起，并且Mn-Mn 交换相互作用能不仅与晶格常数a有关，而且与晶格常数c有关.用Kittle的交换反转模型讨 论了低温时的铁磁—反铁磁一阶相变.
关键词：
稀土金属间化合物
磁相变
磁弹性
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| 关 键 词： | 稀土金属间化合物 磁相变 磁弹性 |
| 收稿时间： | 2000-01-22 |
| 修稿时间： | 4/8/2000 12:00:00 AM |
SPONTANEOUS MAGNETIC PHASE TRANSITION AND MAGNETOELASTIC ANOMALIES AT TRANSITION S IN INTERMETALLIC COMPOUNDS RMn2Ge2 (R=La,Pr,Nd,Sm,Gd,Tb, Y) |
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| GUO GUANG-HUA and R.Z.LEVITIN.SPONTANEOUS MAGNETIC PHASE TRANSITION AND MAGNETOELASTIC ANOMALIES AT TRANSITION S IN INTERMETALLIC COMPOUNDS RMn2Ge2 (R=La,Pr,Nd,Sm,Gd,Tb, Y)[J].Acta Physica Sinica,2000,49(9):1838-1845. |
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| Authors: | GUO GUANG-HUA and RZLEVITIN |
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| Abstract: | The temperature dependence of lattice constants a and c of intermetallic compounds RMn2Ge2 (R=La,Pr,Nd,Sm,Gd,Tb and Y)is measured in the t emperature range 10—800K using the X-ray method. The magnetoelastic anomalies o f a(T) and c(T) are found at different spontaneous magnetic phase transitions. I t is shown that the magnetoelastic anomalies are mainly determined by the Mn-sub system. Mn-Mn exchange interactions depend not only on the lattice constant a bu t also on constant c. Low-temperature ferromagnetic-antiferromagnetic transition s are discussed in the framework of Kittle's exchange inversion model. |
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| Keywords: | rare-earth intermetallic compound magnetic phase transition magnetoelasticity |
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