Electroinic Structure and Transition Temperature of the d-p Model

概要

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The dressed d-electron Green's function of the d-p model is computed self-consistently based onthe fluctuation-exchange approximation. Using this Green's function and assuming the d.c .2synametry for the rnotnentum dependence of the gap ftrnction, we obtain the reasonable super-conducting transition temperature T. in the several cases where the d-(p-)hole number is close tothe experimental value of La).75Srg.z,jCuO,j based on NMR/NQR analyses. Using this Green'sfunction, we calctrlate the d-electron spin strsceptibility, which has very sharp incounrnensuratepeaks near T. for the low frequency as observed in neutron scattering data on L2lL1.86SI0.14CVlO4.The qtuasi-particle excitation spectrum in the normal state near T. is also obtained frorn thisGreen's function. The energy dispersion of quasi-particles near the Fermi level is alrnost flataround the (m/a,O) point. This electronic structure is due to many-body effects, rather thanbeing induced by band effects.
社団法人日本物理学会の論文
1997-05-15