Abstract
Superconducting (SC) La3Ni2B2N3-δ (Tc ~ 12 K) crystallizes in a body-centered tetragonal structure consisting of Ni2B2 layers built from NiB4 tetrahedra and LaN rocksalt-type layers [1] and is isostructural to the rare earth nickel borocarbide Y3Ni2B2C3 which is a non-superconducting variant [2] of the T c ≃ 15.5 K superconductor YNi2B2C. Band calculations revealed for the latter that the density of states at the Fermi level exhibits predominant Ni(3d) orbital character [3]. Thus, one may expect that the larger separation of the Ni2B2 layers by LaN triple layers in the boronitride gives more anisotropic properties. The electronic structure of La3Ni2B2N3 reveals indeed a significantly larger anisotropy of the Fermi surface velocities v x : v z ~ 2 : 1 compared to LuNi2B2C with v x : v z roughly 1:1, though its three-dimensional metallic character is preserved [4].
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Michor, H., Manalo, S., Hilscher, G. (2001). Comparison of the Borocarbide and Boronitride Superconductors. In: Müller, KH., Narozhnyi, V. (eds) Rare Earth Transition Metal Borocarbides (Nitrides): Superconducting, Magnetic and Normal State Properties. NATO Science Series, vol 14. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0763-4_4
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DOI: https://doi.org/10.1007/978-94-010-0763-4_4
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