Crystal growth, transport, and magnetic properties of Ln3Co4Sn13 (Ln=La, Ce) with a perovskite-like structure |
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Authors: | Evan Lyle Thomas Andrew N. Bankston Peter Klavins David P. Young Julia Y. Chan |
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Affiliation: | a Department of Chemistry, Louisiana State University, 232 Choppin Hall, Baton Rouge, LA 70803, USA b Department of Physics, University of California, Davis, CA 95616, USA c Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA |
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Abstract: | Ln3Co4Sn13 (Ln=La, Ce) have been synthesized by flux growth and characterized by single crystal X-ray diffraction. These compounds adopt the Yb3Rh4Sn13-type structure and crystallize in the cubic space group (No. 223) with Z=2. Lattice parameters at 298 K are , , and , for the La and Ce analogues, respectively. The crystal structure consists of an Sn-centered icosahedron at the origin of the unit cell, which shares faces with eight Co trigonal prisms and 12 Ln-centered cuboctahedra. Magnetization data at 0.1 T show paramagnetic behavior down to 1.8 K for Ce3Co4Sn13, with per Ce3+, while conventional type II superconductivity appears below 2.85 K in the La compound. Electrical resistivity and specific heat data for the La compound show a corresponding sharp superconducting transition at Tc∼2.85 K. The entropy and resistivity data for Ce3Co4Sn13 show the existence of the Kondo effect with a complicated semiconducting-like behavior in the resistivity data. In addition, a large enhanced specific heat coefficient at low T with a low magnetic transition temperature suggests a heavy-fermionic character for the Ce compound. Herein, the structure and physical properties of Ln3Co4Sn13 (Ln=La, Ce) are discussed. |
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Keywords: | Ce3Co4Sn13 La3Co4Sn13 Ln3Co4Sn13 SnLn3Co4Sn12 SnCe3Co4Sn12 X-ray diffraction Electrical resistivity Rare-earth cuboctahedra Icosahedra Rare-earth intermetallics Stannides Superconductivity Specific heat Heavy fermion |
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