| Magnetic Properties and magnetic phase diagrams of intermetallic compound GdMn2Ge2 |
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| 作者姓名： | 郭光华 张海贝 R. Z. Levitin |
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| 作者单位： | School of Physics Science and Technology, Central South University, Changsha 410083, China;School of Physics Science and Technology, Central South University, Changsha 410083, China;Department of Physics, M.V. Lomonosov Moscow State University, 119899 Moscow, Russia |
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| 基金项目： | Project supported by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry, China. |
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| 摘 要： | A modified Yafet－Kittle model is applied to investigate the magnetic properties and magnetic phase transition of the intermetallic compound GdMn_2Ge_2. Theoretical analysis and calculation show that there are five possible magnetic structures in GdMn_2Ge_2. Variations of external magnetic field and temperature give rise to the first-order or second-order magnetic transitions from one phase to another. Based on this model, the magnetic curves of GdMn_2Ge_2 single crystals at different temperatures are calculated and a good agreement with experimental data has obtained. Based on the calculation, the H－T magnetic phase diagrams of GdMn_2Ge_2 are depicted. The Gd－Gd, Gd－Mn, intralayer Mn－Mn and interlayer Mn－Mn exchange coupling parameters are estimated. It is shown that, in order to describe the magnetic properties of GdMn_2Ge_2, the lattice constant and temperature dependence of interlayer Mn－Mn exchange interaction must be taken into account.
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| 关 键 词： | GdMn2Ge2 金属间化合物 Yafet－Kittle模型 钆锰锗化合物 磁相图 相变 磁学性质 磁性材料 磁结构 |
| 收稿时间： | 2002-12-31 |
Magnetic properties and magnetic phase diagrams of intermetallic compound GdMn2Ge2 |
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| Guo Guang-Hu,Zhang Hai-Bei and R. Z. Levitin.Magnetic Properties and magnetic phase diagrams of intermetallic compound GdMn2Ge2[J].Chinese Physics B,2003,12(6):655-660. |
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| Authors: | Guo Guang-Hu Zhang Hai-Bei and R Z Levitin |
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| Institution: | Department of Physics, M.V. Lomonosov Moscow State University, 119899 Moscow, Russia; School of Physics Science and Technology, Central South University, Changsha 410083, China |
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| Abstract: | A modified Yafet－Kittle model is applied to investigate the magnetic properties and magnetic phase transition of the intermetallic compound GdMn_2Ge_2. Theoretical analysis and calculation show that there are five possible magnetic structures in GdMn_2Ge_2. Variations of external magnetic field and temperature give rise to the first-order or second-order magnetic transitions from one phase to another. Based on this model, the magnetic curves of GdMn_2Ge_2 single crystals at different temperatures are calculated and a good agreement with experimental data has obtained. Based on the calculation, the H－T magnetic phase diagrams of GdMn_2Ge_2 are depicted. The Gd－Gd, Gd－Mn, intralayer Mn－Mn and interlayer Mn－Mn exchange coupling parameters are estimated. It is shown that, in order to describe the magnetic properties of GdMn_2Ge_2, the lattice constant and temperature dependence of interlayer Mn－Mn exchange interaction must be taken into account. |
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| Keywords: | rare earth intermetallics magnetic phase transition magnetic structure |
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