Abstract
Superconductivity in the layered yttrium diboride dicarbide, YB2C2, has been revisited by means of specific heat, magnetic susceptibility and resistivity measurements down to 50 mK revealing a bulk superconducting transition at 1.0 K. Analysing the low temperature specific heat we obtain a Sommerfeld coefficient of the normal state electonic contribution, γ = 3.1(1) mJ/molK2, and a Debye temperature, ΘDLT = 680(10) K. The specific heat anomaly at Tc, ΔC ≊ 4.5mJ/mol K, thus, yields a thermodynamic ratio ΔC/γTc — 1.4 in close agreement with the BCS value. For polycrystalline Y11B2C2 prepared by inductive melting we observe a pronounced resistive anomaly near 3.6 K which, however, corresponds to a rather spurious specific heat anomaly and is thus attributed to traces of YC2 present in this sample.
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