GORSSE, Stéphane; CHEVALIER, Bernard; TUNCEL, Selcan; PÖTTGEN, Rainer

doi:10.1016/j.jssc.2009.01.027

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GORSSE, Stéphane
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

CHEVALIER, Bernard
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

TUNCEL, Selcan
Institut für Anorganische und Analytische Chemie

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Journal of Solid State Chemistry. 2009, vol. 182, n° 4, p. 948-953

Elsevier

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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.< Réduire

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Gadolinium based compound

Magnetically ordered material

Metamagnet

Magnetocaloric effect

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Metamagnetic transition in the 75 K antiferromagnet Gd<sub>4</sub>Co<sub>2</sub>Mg<sub>3</sub>

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