Theoretical Study on the Superconductivity Induced by the Dynamic Jahn-Teller Effect in Alkali-Metal-Doped C_<60> : Condensed Matter: Electronic Properties, etc.

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概要

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• We investigate the superconductivity in alkali-metal-doped C_<60>, A_3C_<60>. (A=K, Rb, etc.) To take account of both the electron-electron and electron-phonon interactions, we employ a model introduced in our previous study for explaining the reason why A_2C_<60> and A_4C_<60> are, in contrast to A_3C_<60>, insulators despite that these materials are expected to be good metals. It is found that the superconductivity can also be explained on the same basis that is essential for explaining the anomaly in A_2C_<60> and A_4C_<60>. The origin of the superconductivity in our model is the dynamic Jahn-Teller effect; the attractive interaction between the t_<1u> electrons is caused by the dynamic Jahn-Teller effect resulting from the pair transfer interaction originated in the coupling between the t_<1u> electrons and the H_g intramolecular phonons. The order parameter of the superconductivity is spin-singlet and of the A_g Symmetry. We also point out that the dynamic Jahn-Teller mechanism revealed here is closely related to the Suhl-Kondo mechanism. The multiplic.ity of the t_<1u> bands is indispensable for both mechanisms.

• 社団法人日本物理学会の論文
• 2000-08-15

著者

• SUZUKI Shugo

  Institute of Materials Science, University of Tsukuba

• NAKAO Kenji

  Institute of Materials Science, University of Tsukuba

• Suzuki Shugo

  Institute Of Materials Science University Of Tsukuba

• OKADA Susumu

  Institute of Materials Science, University of Tsukuba

• Okada S

  Institute Of Materials Science University Of Tsukuba

• Suzuki S

  Institute Of Materials Science University Of Tsukuba

• Nakao Kenji

  Institute Of Materials Science University Of Tsukiba

• Okada Susumu

  Institute Of Materials Science University Of Tsukuba

• Nakao Kenji

  Institute Of Materials Science Uneversity If Tsukuba

• Suzuki Shugo

  Institute of Material Science, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan

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