Abstract
SUPERCONDUCTING intermetallic compounds with relatively high transition temperature (Tc) have been found in the systems Ln–Tr–B–C, where Ln is a lanthanide element (Y, Ho–Lu) and Tr a transition metal (Pd or Ni)1,2. In the nickel-bearing system, the superconducting phase has the formula LnNi2B2C (ref. 2). Although many structures are known for ternary carbides and borides, only a few have been reported for quaternary boro-carbides3. Here we describe two new phases that form in the Lu–Ni–B–C system: LuNi2B2C, a superconductor with a Tc of 16.6 K (ref. 2), and LuNiBC, a closely related non-superconducting phase. The superconductor is a variant on the layered ThCr2Si2-type structure4, with additional carbon in the Lu plane. LuNiBC is derived from LuNi2B2C by adding another layer of Lu–C, producing a NaCl-type intergrowth. A new homologous series of inter-metallic phases may be derivable from the simple building principles of these two structures.
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Siegrist, T., Zandbergen, H., Cava, R. et al. The crystal structure of superconducting LuNi2B2C and the related phase LuNiBC. Nature 367, 254–256 (1994). https://doi.org/10.1038/367254a0
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DOI: https://doi.org/10.1038/367254a0
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