Cooperative Bipolaron Tunneling in High T_c Copper Oxide Compounds and Superconductivity

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概要

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• A possible occurrence of cooperative Jahn-Teller distortion in La_2CuO_4 is suggested. In doped (La_<1-x>M_x)_2CuO_4 the d holes in Cu^<2+> ions in |X^2-y^2>orbitals tend to form a polaron pair in the Cu^<2+>-O^<2->-Cu^<2+> form, and consequently extra d holes in |z^2> orbitals in Cu^<3+> ions also form a polaron pair in a less distorted situation. Then the coherent tunneling of an extra bipolaron occurs through all the Cu^<2+>-O^<2->-Cu^<2+> sites, and the extra bipolarons make a Bose condensation at the zero wavevector state. This causes high T_c superconductivity. T_c is related to the superexchange between the spins of d holes in |z^2> orbital and suggested not to exceed the Neel temperature of La_2CuO_4.

• 社団法人応用物理学会の論文
• 1987-05-20

著者

• Kamimura Hiroshi

  Department Of Applied Physics . Faculty Of Science Tokyo University Of Science

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