Abstract
After the discovery of MgB2, much attentionhas been paid to the boride and carbide systems. In this paper, we mainly review the following subjects. First, we review the present situation of the superconductivity in MgB2, which can be interpreted in terms of BCS-type phonon-mediated pairing. In particular, we focus on the relationship between the superconductivity and the electronic structure in MgB2 and two gap feature. Second, we review our present status for the new superconductors including the carbon systems. Recently, we have reported a relatively high-Tc superconductivity in Y2C3 at 18 Kwhose Tc could be changed by synthesis conditions from 10 to 18 K [J. Phys. Soc. Jpn. 73 (2004) 530.]. We synthesized a high-purity sample of the medium-Tc phase (Tc=13.9 K) in Y2C3 and examined its physical properties. From a specific heat measurement, ⊿C(Tc)/ɣTc value is calculated to be 3.3 and the superconducting gap is estimated to be 2⊿/kBTc = 4.5, indicating that the superconductivity in Y2C3 can be described by s-wave strong coupling regime. From specific heat in various magnetic fields, the upper critical field Hc2(0) is estimated to be 24.7 T.
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Akutagawa, S., Muranaka, T., Akimitsu, J. (2007). II.1 Magnesium diboride and the two-band scenario. In: Scharnberg, K., Kruchinin, S. (eds) Electron Correlation in New Materials and Nanosystems. NATO Science Series, vol 241. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-5659-8_6
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