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. Levitinb
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
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.
Received: 31 December 2002
Revised: 31 March 2003
Accepted manuscript online:
PACS:
75.30.Kz
(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))
Fund: Project supported by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry, China.
Cite this article:
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 2003 Chinese Physics 12 655
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