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Structure and magnetic properties of EuMnxGa3-x.

Authors :
Guo, Yongquan
Grin, Yuin
Schnelle, Walter
Li, Wei
Source :
Journal of Applied Physics. 5/1/2007, Vol. 101 Issue 9, p09N505. 3p. 1 Diagram, 1 Chart, 4 Graphs.
Publication Year :
2007

Abstract

The crystal structure and magnetic properties of EuMnxGa3-x intermetallics have been investigated using powder x-ray diffraction and magnetic measurement. EuMnxGa3-x crystallizes in an orthorhombic structure with a space group of Cmcm, and Z=4. The lattice parameters are a=4.294(1)–4.287(1) Å, b=18.50(3)–18.57(3) Å, and c=4.384(6)–4.372(9) Å. In each unit cell, there are four nonequivalent 4c crystal positions for 4Eu, 4GaI, 4(GaII,Mn), and 4GaIII. EuMnxGa3-x (x<0.27) intermetallic compounds are antiferromagnetic at low temperature. A magnetic transition from the paramagnetic to the ferromagnetic occurs in EuMn0.3Ga2.7 at room temperature when applying a low field of 40 Oe. Moreover, this ferromagnetic order is very weak and sensitive to the applied field. With increasing the applied field, the ferromagnetic order tends to vanish. This phenomenon might be interpreted as the Mn spin state change induced by charge balance at low field. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00218979
Volume :
101
Issue :
9
Database :
Academic Search Index
Journal :
Journal of Applied Physics
Publication Type :
Academic Journal
Accession number :
25115112
Full Text :
https://doi.org/10.1063/1.2710228