Europhys. Lett.
Volume 72, Number 4, November 2005
Page(s) 652 - 657
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 12 October 2005
Europhys. Lett., 72 (4), pp. 652-657 (2005)
DOI: 10.1209/epl/i2005-10268-x

Magnetocaloric effect in the intermetallic compound $\chem{{Gd}_{5}{Si}_{2}{Sb}_{2}}$

R. Nirmala1, A. V. Morozkin2 and S. K. Malik1

1  Tata Institute of Fundamental Research - Mumbai 400 005, India
2  Moscow Lomonosov State University - Moscow, GSP-2, 119992, Russia

received 26 July 2005; accepted in final form 16 September 2005
published online 12 October 2005

The rare-earth intermetallic compound, $\chem{{Gd}_{5}{Si}_{2}{Sb}_{2}}$ (orthorhombic $\chem{Sm_{5}Ge_{4}}$-type, space group Pnma), has been synthesized and is found to be a ferromagnet with a transition temperature, $T_\ab{C}$, of $\sim 240\un{K}$. Magnetization vs. field isotherms for this compound were measured in the vicinity of $T_\ab{C}$ in applied fields upto 7 $\un{tesla}$. Using these data, the isothermal magnetic entropy change, $\Delta
S_\ab{M}$, has been computed. The magnetic entropy change is large, attains a value of $\sim $ 4.8 $\un{J/kg/K}$ at $T_\ab{C}$ for a field change of 7$\un{T}$ and is spread over a wide temperature range exhibiting a table-like magnetocaloric effect, thus making this material attractive for Ericson-cycle magnetic refrigerator applications.

75.30.Sg - Magnetocaloric effect, magnetic cooling.
75.50.Cc - Other ferromagnetic metals and alloys.
75.47.-m - Magnetotransport phenomena; materials for magnetotransport.

© EDP Sciences 2005