The boride compounds MB_x related to the magnesium-boron stacking layered material MgB2 are discussed in terms of the B-B layers in the borides analogous to the Cu-O ones in the cuprates. We propose a possibility of superconducting materials which exhibit higher critical temperature T_c than 39 K of MgB2. We point out a role of interstitial ionic atoms M (e.g., Mg in MgB2) as capacitors, which reduce the condensation-energy loss due to the charging energy E_c between the B-B layers. In the viewpoint of the present model, the recently discovered 117-Kelvin superconductor C60/CHBr3 is also discussed in terms of the intercalation molecules CHBr3 as possible capacitors among the superconducting grains of C60 molecules.
@article{arxiv.cond-mat/0109251,
title = {Critical Temperature T_c versus Charging Energy E_c in MgB2 and C60/CHBr3},
author = {Chikao Kawabata and Nobuhiko Hayashi and Fumihisa Ono},
journal= {arXiv preprint arXiv:cond-mat/0109251},
year = {2009}
}
Comments
9 pages, 1 fugure included; prepared for Proceedings of the symposium ISS2001, Kobe, Sep. 2001