Superconductivity in (LuC)2(Ni2B2) and (LuC)(Ni2B2)

L. Gao; X. D. Qiu; Y. Cao; R. L. Meng; Y. Y. Sun; Y. Y. Xue; C. W. Chu

doi:10.1103/PhysRevB.50.9445

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Superconductivity in (LuC)2(Ni2B2) and (LuC)(Ni2B2)

L. Gao, X. D. Qiu, Y. Cao, R. L. Meng, Y. Y. Sun, Y. Y. Xue, C. W. Chu

DOI 10.1103/PhysRevB.50.9445 · Physical Review B

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Abstract

We have studied (LuC)2(Ni2B2) and (LuC)(Ni2B2) at ambient and high pressures. Superconductivity was discovered in (LuC)2(Ni2B2) at 2.9 K. Pressure was found to suppress both the electrical resistivity and the superconducting transition temperature rapidly for (LuC)2(Ni2B2) but only slightly for (LuC)(Ni2B2), in spite of their similar chemical-bonding behavior. The observations can be understood in terms of the smaller density of states at the Fermi surface and the greater pressure-induced band broadening of (LuC)2(Ni2B2) than (LuC)(Ni2B2).

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
(LuC)2(Ni2B2) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.9	Pressure unresolved	onset
(LuC)(Ni2B2) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	17	Pressure not reported	unknown