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The diboride materials MB2 (M = Mg, Be, Pb, etc.) are discussed on the basisof the 3D Josephson junction array (JJA) model due to Kawabata-Shenoy-Bishop,in terms of the B-B layers in the diborides analogous to the Cu-O ones in thecuprates.  We propose a possibility of superconducting materials with the MgB2-typestructure which exhibit higher critical temperature Tc over 39K of MgB2.  We point out a role of interstitial ionic atoms (e.g., Mg in MgB2) ascapacitors between the B-B layers, which reduce the charging coupling energy inJJA.Comment: 3 pages, 1 figure included; to be published in J. Phys. Soc. Jpn. 70,  No.10 (2001

journal of the physical society of japan

Critical Temperature Tc and Charging Energy Ec between B–B Layers of Superconducting Diboride Materials MgB2 in 3D JJA Model