Magnetic properties of off-stoichiometric R2Co3Zn14 (R=Y,Gd) single crystals |
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Authors: | Athena S Sefat Sergey L Bud’koPaul C Canfield |
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Institution: | Ames Laboratory, Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA |
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Abstract: | Single crystal X-ray diffraction data indicate that the R2Co3Zn14 (R=Gd, Y) phase crystallizes non-stoichiometrically with a mixed occupancy of Co/Zn atoms on the 12-coordinated transition metal site and one of the three zinc sites. The crystals are rhombohedral with R-3m space group. Magnetization measurements provide no evidence of localized 3d electron moment in Y2Co2.3Zn14.7 which is non-magnetic down to 1.8 K. Thermodynamic and transport measurements on two Gd2Co3+xZn14−x crystals reveal that the extra cobalt influences temperature below which the samples enter into an antiferromagnetic state: TN=31.5(3) K for Gd2Co3Zn14 and 28(1) K for Gd2Co4.2Zn12.8. A lower magnetic ordering temperature of Tmag=6.0(2) K is common in both Gd samples. |
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Keywords: | Zincide Flux growth Magnetic anisotropy Heat capacity Magnetization Single crystal X-ray Resistivity |
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