Role of 2D Electron-Hole Lattice Systerm in Modulated Structure of High-T_c Superconductor Bi_<2-x>Pb_xSr_2CaCu_2O_<8+δ

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The role of a 2D electron-hole lattice system in the modulated structure of Bi_<2-x>Pb_xSr_2CaCu_2O_<8+δ(Pb-doped Bi-2212) is discussed. The 2D electron-hole lattice system is constructed by neutralizing local polarization charges on the crystal surface or between two adjacent layers. Assuming that the Pb type of modulation is obtained byreversing two neighboring polarizations in the Bi type of modulation in pairs, we explain the following experimental findings: (1) the ratio of the modulation period of the Pb type structure, k_2, to that of the Bi type structure, k_1 ,gives discrete values, such as k_3/k_1=3/2, 5/3, and 2; (2) as x increases, k_2 tends to increase and approximately follows the relationship k_2-k_1∝x; (3) when the sample is irradiated with an intense electron beam, the modulation of the Pb type transforms into that of the Bi type. The physical meaning of the above assumption is discussed.
社団法人応用物理学会の論文
1993-08-15