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Critical Temperature Tc versus Charging Energy Ec in MgB2 and C60/CHBr3

By Chikao Kawabata A, Nobuhiko Hayashi B and Fumihisa Ono C

Abstract

The boride compounds MBx 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 Tc 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 Ec 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. Key words: MgB2, C60/CHBr3, Josephson Junction Array model, Electric polarizability

Topics: Charging energy
Year: 2001
OAI identifier: oai:CiteSeerX.psu:10.1.1.310.8400
Provided by: CiteSeerX
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