Superconductivity at 15 K in the metastable ScNi2B2C compound

H. C. Ku; C. C. Lai; Y. B. You; J. H. Shieh; W. Y. Guan

doi:10.1103/PhysRevB.50.351

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Superconductivity at 15 K in the metastable ScNi2B2C compound

H. C. Ku, C. C. Lai, Y. B. You, J. H. Shieh, W. Y. Guan

DOI 10.1103/PhysRevB.50.351 · Physical Review B

T1

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Abstract

A superconducting transition around 15–16 K is reported for metastable, as-melted ScNi2B2C samples. Zero resistivity Tc(zero) was observed at 14.6 K with Tc(onset) around 16.5 K. A consistent diamagnetic Tc signal was observed around 14.8–15.6 K. The new superconducting phase was identified as isostructural to the quaternary LuNi2B2C-type phase with tetragonal lattice parameters a=3.34 Å and c=10.2 Å. This superconducting phase is unstable due to the extremely small Sc3+ ionic size, where the Sc atom is located in the cavity formed by the B-Ni-B-C network and no superconducting transition could be observed down to 5 K after 1050 °C annealing.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
ScNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	14.6	Pressure not reported	zero_resistance
ScNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	16.5	Pressure not reported	onset
ScNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	14.8	Pressure not reported	onset
ScNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	15.6	Pressure not reported	onset
LuNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	16.7	Pressure not reported	zero_resistance
LuNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	17.6	Pressure not reported	onset
YNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	15.6	Pressure not reported	unknown
(Lu0.5Sc0.5)Ni2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	15.9	Pressure not reported	unknown