Acta Medica Okayama 71 22 2005 Metallic phase in the metal-intercalated higher fullerene Rb8.8(7)C84 EN Yoshie Rikiishi Yoko Kashino Haruka Kusai Yasuhiro Takabayashi Eiji Kuwahara Yoshihiro Kubozono Takashi Kambe Taishi Takenobu Yoshihiro Iwasa Naomi Mizorogi Shigeru Nagase Susumu Okada <p>A new material of higher fullerene, RbxC84, was synthesized by intercalating Rb metal into C-84 crystals. The RbxC(84) crystals showed a simple cubic (sc) structure with lattice constant, a, of 16.82 (2) angstrom at 6.5 K, and 16.87 (2) angstrom at 295 K. The Rietveld refinements were achieved with the space group, Pa (3) over bar, based on a model that the C-2 axis of D2d-C84 aligned along [111]. The sample composition was determined to be Rb-8.8(7) C-84. The ESR spectrum at 303 K was composed of a broad peak with peak-to-peak linewidth Delta H-pp of 220 G, and a narrow peak with Delta H-pp of 24 G. Temperature dependence of the broad peak clearly showed a metallic behavior. The metallic behavior was discussed based on a theoretical calculation. This finding of new metallic phase in a higher fullerene is the first step for a development of new types of fullerene materials with novel physical properties such as superconductivity.</p> No potential conflict of interest relevant to this article was reported.

Acta Medica Okayama 71 22 2005 Superconductivity of the ternary boride Li2Pd3B probed by B-11 NMR EN M Nishiyama Y Inada Guo-qing Zheng <p>We report a B-11 NMR measurement on the recently discovered superconductor Li2Pd3B. The nuclear spin lattice relaxation rate 1/T-1 shows a well-defined coherence peak just below T-c(H=1.46 T)=5.7 K, and the spin susceptibility measured by the Knight shift also decreases below T-c. These results indicate that the superconductivity is of conventional nature, with an isotropic gap. Our results also suggest that the p-electrons of boron and the d-electrons of palladium that hybridize with boron p-electrons are primarily responsible for the superconductivity.</p> No potential conflict of interest relevant to this article was reported.