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Publication Citation: Direct Measurement of the Magnetocaloric Effect in Gd_{5}Si_{2}Ge_{1.9}Ga_{0.1}

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Author(s): E. N. Palacios; G. F. Wang; R. Burriel; Virgil Provenzano; Robert D. Shull;
Title: Direct Measurement of the Magnetocaloric Effect in Gd_{5}Si_{2}Ge_{1.9}Ga_{0.1}
Published: March 19, 2010
Abstract: Doping with some metals (Fe, Cu, Ga, Mn, Al) reduces or removes the strong thermal hysteresis in the giant magnetocaloric alloys Gd_{5}Si_{x}Ge_{1-x}_{4}. We present heat capacity and direct measurements of the isothermal entropy change, ¢ST , and adiabatic temperature increment, ¢TS, of Gd_{5}Si_{2}Ge_{1.9}Ga_{0.1}. TC = 293.6 § 0.2 K is quite higher than in the non-substituted alloys and similar to the values in the Si rich compounds (i.e. x > 0:5). The results indicate that even this small addition of Ga makes the transition of second-order type, as a usual magnetic transition in the orthorhombic phase. The magnetocaloric parameters are lower than in the non-substituted compound and comparable to those for pure Gd.
Citation: Journal of Physics: Condensed Matter
Pages: 4 pp.
Keywords: direct thermal measurements, Ga-doped Gd_{5}Ge_{2}Si_{2}, magnetic hysteresis, magnetocaloric alloys
Research Areas: Magnetic materials
PDF version: PDF Document Click here to retrieve PDF version of paper (739KB)