Magnetic properties and room-temperature magnetocaloric effect in the doped antipervoskite compounds Ga1−xAlxCMn3 (0≤x≤0.15) |
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Authors: | BS WangCC Li S LinJC Lin LJ LiP Tong WJ LuXB Zhu ZR YangWH Song JM DaiYP Sun |
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Institution: | a Key Laboratory of Materials Physics, Institute of Solid State Physics, Hefei 230031, People's Republic of China b High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, People's Republic of China |
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Abstract: | We report the effects of Al doping on the structure, magnetic properties, and magnetocaloric effect of antiperovskite compounds Ga1−xAlxCMn3 (0≤x≤0.15). Partial substitutions of Al for Ga enhance the Curie temperature (from 250 K for x=0.0 to 312 K for x=0.15) and the saturation magnetization. On increasing the doping level x, the maximum values of the magnetic entropy change (−ΔSM) decreases while the temperature span of −ΔSM vs. T plot broadens. Furthermore, the relative cooling power (RCP) is also studied. For 20 kOe, the RCP value tends to saturate at a high doping level (for x=0.12, 119 J/kg at 296 K). However, at 45 kOe, the RCP value increases quickly with increasing x (for x=0.15, 293 J/kg at 312 K). Considering the relatively large RCP and inexpensive raw materials, Ga1−xAlxCMn3 may be alternative candidates for room-temperature magnetic refrigeration. |
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Keywords: | Antiperovskite Magnetic property Ga1&minus xAlxCMn3 |
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