- 著者
-
Koikegami Shigeru
Fujimoto Satoshi
Yamada Kosaku
- 出版者
- 一般社団法人日本物理学会
- 雑誌
- Journal of the Physical Society of Japan (ISSN:00319015)
- 巻号頁・発行日
- vol.66, no.5, pp.1438-1444, 1997-05-15
- 被引用文献数
-
14
56
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.