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Electronic and superconducting properties of the binary carbide La2C3
김준성,Reinhard K. Kremer,Ove Jepsen,Arndt Simon 한국물리학회 2006 Current Applied Physics Vol.6 No.5
We have studied the electronic structure and investigated the synthesis conditions to optimize the superconducting properties ofthe binary carbide La2C3. From the electronic structure calculation based on two dierent reported crystal structure determinations,the Fermi level (EF) is found to be located near a local minimum of the density of state (DOS) and the DOS atEFvaries with a slightchange of the structural parameters. These results are consistent with the fact that the superconducting properties of La2C3 are sen-sitive to the preparation conditions and the annealing procedure. By a careful control of the C deciency we have improved thesuperconducting properties and prepare samples showing a sharp superconducting transition ofTc = 13.213.3 K. Critical elds,Hc2 (T), estimated from resistivity and susceptibility measurement are considerably higher than reported previously.
Reinhard K. Kremer,Arndt Simon 한국물리학회 2004 Current Applied Physics Vol.4 No.5
We have been exploring routes and systems alternative to the oxocuprates and the oxomanganates and searched for super-conductivity and large magnetoresistance in rare earth compounds, particularly, in the family of layered metallic rare earth halidesand rare earth carbides. Here we review the superconducting properties of YC2,La2C3, and RE2C2X2 (RE¼ Y, La; X¼ Cl, Br, I) aswell as some recent results of the large magnetoresistance eect in the ferromagnet GdI2.
김영욱,김준성,Kim, Young-Wook,Kremer, Reinhard K.,Kim, Jun-Sung 한국초전도학회 2011 Progress in superconductivity Vol.12 No.2
We have investigated the anisotropy of the superconducting properties for $CaC_6$ and $SrC_6$ using upper critical fields ($H_{c2}$) and specific heat ($C_p$). From the upper critical fields of $CaC_6$ at different magnetic field orientations, H//c and H// ab, the anisotropy is found to be ~ 5 at low temperatures, much larger than that of $SrC_6$. These results are in contrast to the stronger anisotropy in the electronic structure for $SrC_6$ than for $CaC_6$ indicating a stronger anisotropy in the superconducting gap in $CaC_6$. The findings are confirmed by the temperature dependence of the superconducting specific heat below $T_c$ for $CaC_6$ and $SrC_6$, suggesting the important role of anisotropic electron-phonon coupling in superconducting intercalated graphites.