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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.
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.