Filling the holes in the CaFe$_{4}$As$_{3}$ structure: synthesis and magnetism of CaCo$_{5}$As$_{3}$

P. F. S. Rosa; B. L. Scott; F. Ronning; E. D. Bauer; J. D. Thompson

doi:10.1103/PhysRevMaterials.1.024409

paper

Filling the holes in the CaFe $_{4}$ As $_{3}$ structure: synthesis and magnetism of CaCo $_{5}$ As $_{3}$

arXiv:1711.08402 · doi:10.1103/PhysRevMaterials.1.024409

Abstract

Here we investigate single crystals of CaCo $_{5}$ As $_{3}$ by means of single crystal X-ray diffraction, microprobe, magnetic susceptibility, heat capacity, and pressure-dependent transport measurements. CaCo $_{5}$ As $_{3}$ shares the same structure of CaFe $_{4}$ As $_{3}$ with an additional Co atom filling a lattice vacancy and undergoes a magnetic transition at $T_{M} = 16$ K associated with a frustrated magnetic order. CaCo $_{5}$ As $_{3}$ displays metallic behavior and its Sommerfeld coefficient ( $γ = 70$ mJ/mol.K $^{2}$ ) indicates a moderate enhancement of electron-electron correlations. Transport data under pressures to $2.5$ GPa reveal a suppression of $T_{M}$ at a rate of $- 0.008$ K/GPa. First-principle electronic structure calculations show a complex 3D band structure and magnetic moments that depend on the local environment at each Co site. Our results are compared with previous data on CaFe $_{4}$ As $_{3}$ and provide a scenario for a magnetically frustrated ground state in this family of compounds.

Filling the holes in the CaFe4​As3​ structure: synthesis and magnetism of CaCo5​As3​

Abstract

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Filling the holes in the CaFe $_{4}$ As $_{3}$ structure: synthesis and magnetism of CaCo $_{5}$ As $_{3}$