Effect of Tb/Gd Substitution on Crystal Structure and Exchange Interactions of Gd_{1 - x}Tb_{x}Ni_3 Intermetallic Compounds

• Authors: A. Chrobak , A. Bajorek , G. Chełkowska
• Languages of publication: EN

Abstracts

EN

In the paper an influence of Tb/Gd substitution on crystal structure and exchange interactions of Gd_{1 - x}Tb_{x}Ni_3 (x = 0.0, 0.5, 0.8, 1.0) polycrystalline compounds have been studied. The crystal structure of all samples was checked at the room temperature by means of X-ray diffraction. Exchange integrals of R-R (J_{RR}), T-T (J_{TT}) and R-T (J_{RT}) atoms were evaluated from M(T) magnetization curves (2-300 K, 2 T) based on the mean field theory calculation. As it was shown the samples examined are single phase and crystallize in the PuNi_3 (space group R-3m) type of crystal structure. The Tb/Gd substitution causes the decrease of lattice parameters as well as the volume of the unit cell. With increase of the x parameter the magnetic moment of Tb atoms increases from 6.94 μ_{B} (x = 0.5) to 8.12 μ_{B} (x = 1). The M(T) dependence of the examined compounds depends almost 8 times stronger on exchange interactions within the R-R site than the interactions between the two antiferromagnetically coupled magnetic sublattices R-T.

Keywords

EN

75.50.Gg; 75.30.Et; 71.20.Lp

Discipline

• 75.30.Et: Exchange and superexchange interactions(see also 71.70.Gm Exchange interactions)
• 75.50.Gg: Ferrimagnetics
• 71.20.Lp: Intermetallic compounds

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 121
• Issue: 5-6
• Pages: 1132-1135

Dates

published

2012-05

Contributors

author

A. Chrobak

• A. Chełkowski Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland

author

A. Bajorek

• A. Chełkowski Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland

author

G. Chełkowska

• A. Chełkowski Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland

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Identifiers

DOI

10.12693/APhysPolA.121.1132