DIELECTRIC FUNCTION OF YBA2CU3O7-DELTA BETWEEN 50 MEV AND 50 EV

被引:76
作者
ROMBERG, H
NUCKER, N
FINK, J
WOLF, T
XI, XX
KOCH, B
GESERICH, HP
DURRLER, M
ASSMUS, W
GEGENHEIMER, B
机构
[1] KERNFORSCHUNGSZENTRUM KARLSRUHE GMBH, INST TECH PHYS, W-7500 KARLSRUHE 1, GERMANY
[2] UNIV KARLSRUHE, INST ANGEW PHYS, W-7500 KARLSRUHE, GERMANY
[3] UNIV FRANKFURT, INST PHYS, W-6000 FRANKFURT, GERMANY
[4] MAX PLANCK INST FESTKORPERFORSCH, W-7000 STUTTGART 80, GERMANY
来源
ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER | 1990年 / 78卷 / 03期
关键词
D O I
10.1007/BF01313317
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
Electronic excitations with polarization parallel to the CuO2-planes in single-crystalline YBa2Cu3O7 and YBa2Cu3O6 have been investigated by optical reflectance and by highenergy electron energy-loss spectroscopy in transmission in the energy ranges from 50 meV to 6 eV and 0.2 eV to 150 eV, respectively. From a combination of these experimental data the dielectric function, the reflectivity and the optical conductivity have been obtained in a wide energy range. The observed spectra are interpreted in terms of optical phonons, free-carrier absorption, transitions across the charge-transfer gap, further interband transitions, low-lying core-level excitations, excitonic transitions and valence conserving d-d transitions within the Cu 3 d shell combined with O 2 p intraband transitions. The charge carrier plasmon and the 4 eV-excitation in YBa2Cu3O6 show quadratic dispersions in momentum transfer. From the dispersion constant of the plasmon a mean value of the Fermi velocity of the charge carriers parallel to the CuO2 planes has been derived. © 1990 Springer-Verlag.
引用
收藏
页码:367 / 380
页数:14
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