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2010 | 117 | 4 | 603-606
Article title

Magnetic Properties and Magnetocaloric Effect οf R_{1-x}R'_{x}Mn_{2}Ge_{2} Compounds

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EN
Abstracts
EN
The magnetic and magnetocaloric properties of Sm_{1-x}Gd_{x}Mn_{2}Ge_{2} compounds with 0 ≤ x ≤ 0.10 have been studied. SmMn_{2}Ge_{2} is antiferromagnetic below the Néel temperature T_{N} ( ≈ 400 K). Further cooling leeds to canted ferromagnetic phase below T_C = 341 K. With decreasing temperature, two metamagnetic phase transitions are observed: F2-AF1 at T_2 = 153 K and AF1-F1 at T_1 = 106 K. The maximum values of magnetic entropy change | Δ S_m | are found to be 1.5 J K^{-1} kg^{-1} at T_{1} and 2.0 J K^{-1} kg^{-1} at T_{2} in SmMn_{2}Ge_{2}. The MCE is found to increase with Gd concentration, | Δ S_{m}(T_{1}) | = 3.3 J K^{-1} kg^{-1}, while | Δ S_{m}(T_{2})| is slightly enhanced for x = 0.1. The magnetocaloric effect is found to be positive at T_{1} and negative at T_{2}.
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Contributors
author
  • Institute of Physics, Technical University of Cracow, Podchorążych 1, 30-084 Kraków, Poland
author
  • M. Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland
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Document Type
Publication order reference
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YADDA identifier
bwmeta1.element.bwnjournal-article-appv117n418kz
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