Magnetic properties and magnetic phase diagrams of intermetallic compound GdMn2Ge2

doi:10.1088/1009-1963/12/6/315

中国物理B ›› 2003, Vol. 12 ›› Issue (6): 655-660.doi: 10.1088/1009-1963/12/6/315

Magnetic properties and magnetic phase diagrams of intermetallic compound GdMn₂Ge₂

R. Z. Levitin¹, 郭光华², 张海贝²

(1)Department of Physics, M.V. Lomonosov Moscow State University, 119899 Moscow, Russia; (2)School of Physics Science and Technology, Central South University, Changsha 410083, China

收稿日期:2002-12-31 修回日期:2003-03-31 出版日期:2003-06-16 发布日期:2005-03-16
基金资助:
Project supported by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry, China.

Magnetic properties and magnetic phase diagrams of intermetallic compound GdMn₂Ge₂

Guo Guang-Hua (郭光华)^a, Zhang Hai-Bei (张海贝)^a, R. Z. Levitin^b

^a School of Physics Science and Technology, Central South University, Changsha 410083, China; ^b Department of Physics, M.V. Lomonosov Moscow State University, 119899 Moscow, Russia

Received:2002-12-31 Revised:2003-03-31 Online:2003-06-16 Published:2005-03-16
Supported by:
Project supported by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry, China.

摘要/Abstract

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.

Abstract: A modified Yafet－Kittle model is applied to investigate the magnetic properties and magnetic phase transition of the intermetallic compound GdMn$_2$Ge$_2$. Theoretical analysis and calculation show that there are five possible magnetic structures in GdMn$_2$Ge$_2$. 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$_2$Ge$_2$ 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$_2$Ge$_2$ 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$_2$Ge$_2$, the lattice constant and temperature dependence of interlayer Mn－Mn exchange interaction must be taken into account.

Key words: rare earth intermetallics, magnetic phase transition, magnetic structure

中图分类号: (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))

75.30.Kz

75.30.Et (Exchange and superexchange interactions) 75.10.-b (General theory and models of magnetic ordering)

郭光华, 张海贝, R. Z. Levitin. Magnetic properties and magnetic phase diagrams of intermetallic compound GdMn₂Ge₂[J]. 中国物理B, 2003, 12(6): 655-660.

Guo Guang-Hua (郭光华), Zhang Hai-Bei (张海贝), R. Z. Levitin. Magnetic properties and magnetic phase diagrams of intermetallic compound GdMn₂Ge₂[J]. Chinese Physics, 2003, 12(6): 655-660.

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Magnetic properties and magnetic phase diagrams of intermetallic compound GdMn₂Ge₂

Magnetic properties and magnetic phase diagrams of intermetallic compound GdMn₂Ge₂

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