Metamagnetic transition in the 75 K antiferromagnet Gd<sub>4</sub>Co<sub>2</sub>Mg<sub>3</sub>
Language
en
Article de revue
This item was published in
Journal of Solid State Chemistry. 2009, vol. 182, n° 4, p. 948-953
Elsevier
English Abstract
Gd<sub>4</sub>Co<sub>2</sub>Mg<sub>3</sub> (Nd<sub>4</sub>Co<sub>2</sub>Mg<sub>3</sub> type; space group <i>P</i>2/<i>m</i>; <i>a</i>=754.0(4), <i>b</i>=374.1(1), <i>c</i>=822.5(3) pm and <i>β</i>=109.65(4)° as unit cell ...Read more >
Gd<sub>4</sub>Co<sub>2</sub>Mg<sub>3</sub> (Nd<sub>4</sub>Co<sub>2</sub>Mg<sub>3</sub> type; space group <i>P</i>2/<i>m</i>; <i>a</i>=754.0(4), <i>b</i>=374.1(1), <i>c</i>=822.5(3) pm and <i>β</i>=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 <i>T</i><sub>N</sub>=75(1) K. Moreover, this ternary compound presents a metamagnetic transition at low critical magnetic field (<i>H</i><sub>cr</sub>=0.93(2) T at 6 K) and exhibits a magnetic moment of 6.3(1) μ<sub>B</sub> per Gd-atom at 6 K and <i>H</i>=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 Δ<i>S</i><sub>M</sub>=−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.Read less <
English Keywords
Gadolinium based compound
Magnetically ordered material
Metamagnet
Magnetocaloric effect
Origin
Hal imported