Metamagnetic transition in the 75 K antiferromagnet Gd4Co2Mg3 |
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Authors: | S Gorsse S Tuncel |
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Institution: | a ICMCB, CNRS, Université de Bordeaux, 87 avenue du Docteur Albert Schweitzer, 33608 Pessac Cedex, France b Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms Universität Münster, Corrensstraße 30, 48149 Münster, Germany |
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Abstract: | Gd4Co2Mg3 (Nd4Co2Mg3 type; space group P2/m; a=754.0(4), b=374.1(1), c=822.5(3) pm and β=109.65(4)° as unit cell parameters) was synthesized from the elements by induction melting in a sealed tantalum tube. Its investigation by electrical resistivity, magnetization and specific heat measurements reveals an antiferromagnetic ordering at TN=75(1) K. Moreover, this ternary compound presents a metamagnetic transition at low critical magnetic field (Hcr=0.93(2) T at 6 K) and exhibits a magnetic moment of 6.3(1) μB per Gd-atom at 6 K and H=4.6 T. Due to this transition the compound shows a moderate magnetocaloric effect; at 77 K the maximum of the magnetic entropy change is ΔSM=−10.3(2) J/kg K for a field change of 0-4.6 T. This effect is compared to that reported previously for compounds exhibiting a magnetic transition in the same temperature range. |
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Keywords: | Gadolinium based compound Magnetically ordered material Metamagnet Magnetocaloric effect |
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