Magnetic properties and magnetic phase diagrams of intermetallic compound GdMn2Ge2

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

Abstract

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.

Keywords: rare earth intermetallics magnetic phase transition magnetic structure

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

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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Magnetic properties and magnetic phase diagrams of intermetallic compound GdMn₂Ge₂