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Michor, H., Scheidt, E. W., Manalo, S., Müller, M., Bauer, E., & Hilscher, G. (2009). Superconductivity in layered YB₂C₂. Journal of Physics: Conference Series, 150(5), 052160. https://doi.org/10.1088/1742-6596/150/5/052160
E138-04 - Forschungsbereich Quantum Materials E138-03 - Forschungsbereich Functional and Magnetic Materials
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Date (published):
2009
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Number of Pages:
4
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Peer reviewed:
No
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Keywords:
General Physics and Astronomy
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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 temperatu...
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 approxeq 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.
