X-ray absorption near-edge spectra of overdoped La2−xSrxCuO4 high-Tc superconductors
نویسندگان
چکیده
We present results for realistic modeling of the x-ray absorption near edge structure (XANES) of the overdoped high-Tc superconductor La2−xSrxCuO4 in the hole doping range x = 0.20 − 0.30. Our computations are based on a real-space Green’s function approach in which strong-correlation effects are taken into account in terms of a doping-dependent self-energy. The predicted O K-edge XANES is found to be in good accord with the corresponding experimental results in this overdoped regime. We find that the low energy spectra are dominated by the contribution of O atoms in the cuprate planes, with little contribution from apical O atoms.
منابع مشابه
Cuprates La2−xSrxCuO4 Studied by Angle-resolved Photoemission Spectroscopy
We have performed a systematic angle-resolved photoemission spectroscopy (ARPES) study of the high-Tc cuprates La2−xSrxCuO4, ranging from the underdoped insulator to the superconductor to the overdoped metal. We have revealed a systematic doping evolution of the band dispersions and (underlying) Fermi surfaces, pseudogap and quasi-particle features under the influence of strong electron-electro...
متن کاملSearch for ferromagnetic order in overdoped copper-oxide superconductors
In copper-oxides that show high-temperature superconductivity (HTS), the critical temperature (Tc) has a dome-shaped doping dependence. The cause of demise of both Tc and superfluid density ns on the overdoped side is a major puzzle. A recent study of transport and diamagnetism in a large number of overdoped La2-xSrxCuO4 (LSCO) films shows that this cannot be accounted for by disorder within th...
متن کاملMagnetic-field-induced enhancement of the vortex pinning in the overdoped regime of La2−xSrxCuO4 : Relation to the microscopic phase separation
In order to investigate the inhomogeneity of the superconducting (SC) state in the overdoped high-Tc cuprates, we have measured the magnetic susceptibility, χ, of La2−xSrxCuO4 (LSCO) single crystals in the overdoped regime in magnetic fields parallel to the c-axis up to 7 T on warming after zero-field cooling. It has been found for x = 0.198 and 0.219 that the temperature dependence of χ in 1 T...
متن کاملX-ray absorption spectra reveal the inapplicability of the single-band Hubbard model to overdoped cuprate superconductors.
X-ray absorption spectra on the overdoped high-temperature superconductors Tl2Ba2CuO(6+delta) and La(2-x)SrxCuO(4+/-delta) reveal a striking departure in the electronic structure from that of the underdoped regime. The upper Hubbard band, identified with strong correlation effects, is not observed on the oxygen K edge, while the lowest-energy prepeak gains less intensity than expected above p a...
متن کاملIntraplanarcouplings in theCuO2 latticeof cuprate superconductors
We have investigated the doping dependencies of the basal areas in single-layer high-Tc cuprates La2−xSrxCuO4 and HgBa2CuOx, as well as in two-layer Y1−yCayBa2Cu3Ox and HgBa2CaCu2Ox. The basal areas not only tend to shrink on hole doping, as expected from single electron quantum chemistry, but exhibit also a “bulge” around optimum doping. We attribute the “bulge” to the effects of the strongly ...
متن کامل