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Crystal growth, transport, and magnetic properties of Ln3Co4Sn13 (Ln=La, Ce) with a perovskite-like structure

  • Author(s): Lyle Thomas, E
  • Lee, HO
  • Bankston, AN
  • MaQuilon, S
  • Klavins, P
  • Moldovan, M
  • Young, DP
  • Fisk, Z
  • Chan, JY
  • et al.
Abstract

Ln Co Sn (Ln=La, Ce) have been synthesized by flux growth and characterized by single crystal X-ray diffraction. These compounds adopt the Yb Rh Sn -type structure and crystallize in the cubic space group Pm over(3, -) n (No. 223) with Z = 2. Lattice parameters at 298 K are a = 9.6430 ( 6 ) Å, V = 896.68 ( 10 ) Å , and a = 9.6022 ( 5 ) Å, V = 885.34 ( 8 ) Å 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 Ce Co Sn , with μ = 2.56 μ per Ce , 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 T ∼2.85 K. The entropy and resistivity data for Ce Co Sn 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 Ln Co Sn (Ln=La, Ce) are discussed. © 2006 Elsevier Inc. All rights reserved. 3 4 13 3 4 13 3 4 13 eff B c 3 4 13 3 4 13 3 3 3+

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