Magnetic properties of RPd5Al2 (R=Y, Ce, Pr, Nd, Sm, Gd) |
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Authors: | RA Ribeiro YF Inoue MA Avila T Takabatake |
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Institution: | a Institute for Advanced Materials Research, Hiroshima University, Higashi-Hiroshima 739-8530, Japan b Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima 739-8530, Japan |
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Abstract: | Polycrystalline samples of a new rare-earth series RPd5Al2 crystallizing in the tetragonal ZrNi2Al5-type structure have been prepared. Their physical properties by electrical resistivity ρ, magnetic susceptibility χ, magnetization M and specific heat Cp measurements are reported. The ingots are composed of elongated grains preferentially aligned in the c direction; therefore, measurements were conducted parallel and perpendicular to the grains. Antiferromagnetic ordering appears in R=Ce, Nd, Gd, and Sm at low temperatures. CePd5Al2 has two AFM transitions at 4.1 and 2.9 K and ρ(T) indicates a Kondo metal behavior with large anisotropy. In PrPd5Al2 no magnetic transition was observed down to 0.4 K. The Cp(T) shows a broad peak around 13 K due to the CEF effect, suggesting a non-magnetic singlet ground state. In NdPd5Al2, χ(T) shows anisotropy and the Cp(T) shows a sharp peak at 1.2 K. The magnetic entropy at 3 K is very close to Rln2, indicating a Kramers doublet ground state. In SmPd5Al2, Cp(T) shows a magnetic transition at 1.7 K. Cp(T) for GdPd5Al2 shows a peak at 6 K, followed by a broad anomaly around 3 K. Within this series, TN's for CePd5Al2 and NdPd5Al2 clearly deviate from the relation predicted by de Gennes scaling, which is ascribed to the CEF effect. |
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Keywords: | Rare-earth compounds Magnetically ordered materials Anisotropy Magnetic measurements |
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