On the Electronic and Magnetic Excitation Spectra of High-T_c Cu Oxides in the Normal and Superconducting States : Condensed Matter: Electronic Properties, etc.

概要

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In the discussion of the electronic excitation of high T_c. Cu oxides, effects of the energy broadening of the quasi particles have to be considered. If it is properly done, data of the tunneling density of states published for Bi_2Sr_2CaCu_2O_<8+δ> system can provide a clear indication that the pseudo gap observed above T_c can naturally be understood as the precursor of the superconducting gap. The broadening has been taken into account in simple calculations of the magnetic excitation spectra χ"(q,ω) of YBa_2Cu_3O_y, with a model which is essentially based on the band picture and includes the exchange coupling among electrons. By comparing the calculated results with observed data, experimental evidence for the quasi particle broadening has been found. Brief arguments are presented if the picture of the dynamical "stripes" which affect the superconductivity works in YBa_2Cu_3O_y.
社団法人日本物理学会の論文
2001-05-15