Two- to Three-Dimensional Crossover in the Electronic Structure of(Bi,Pb)2(Sr,La)2CuO<

Abstract

The hole-concentration (x) dependence of the three-dimensional energy-momentum dispersion in (Bi, Pb)2(Sr, La)2CuO(6+delta) has been investigated by angle-resolved photoemission spectroscopy. For a heavily overdoped sample of T(c) < or = 0.5 K, an energy dispersion of approximately 10 meV in width is observed in the vicinity of the (pi, 0) point with varying momentum along the c axis (k(z)). This k(z) dispersion is zero for underdoped, optimally doped, and slightly overdoped samples up to a doping level corresponding to T(c) = 22 k. At higher doping levels we observe significant dispersion of the order of 10 meV (sample with T(c) < or = 0.5 K). This is clear evidence that at a doping value corresponding to T(c) = 22 K, a crossover from two- to three-dimensional electronic structure occurs.

Origin of shadow bands in high-Tc cuprate superconductors studied by high-resolution angle-resolved photoemission spectroscopy

“…As seen from Fig. 1a-c, volume of the hole-like FS systematically expands and the topology shows a distinct transition from hole-like to electron-like consistent with recent ARPES reports on Bi2201 [6,12], Bi2212 [4], and LSCO [13], while the appearance of shadow FS is robust to doping-dependent changes in the character of main FS. SB exists in a [14], and the intensity at E F is obtained by integrating the spectral intensity over the energy range of 20 meV with respect to E F .…”

“…1b and c) due to closure of the pseudogap and the emergence of sharp quasiparticle peak. In order to determine exact location of FS, we estimate k F positions of main band (MB) by fitting the momentum distribution curves (MDC) at E F , except those for the antinodal region of HOD samples; they were determined by tracing the peak position of energy distribution curves (EDC) after dividing the Fermi distribution (FD) function [11,12] since the MDC analysis is not applicable due to proximity of the main band to E F [11]. Next we fit these k F points with tight-binding formula, and determined actual location of the main FS as indicated by solid curves in Fig.…”

Superconductivity in the pseudogap region of Bi2Sr1.4La0.6CuOHu1, Xiao2, Gyawali3 et al. 2012Phys. Rev. B6130View full textAdd to dashboardCite

“…Therefore, in the case of a 2D normal-state electronic structure, as reported for the under-doped (Bi,Pb) 2 (Sr,La) 2 CuO 6+δ samples 20 , one expects an anisotropic superconductivity at least just above T c0 or even at higher temperatures. However, this is not the case based on the present experimental results of the γ values.…”

Three-dimensional dispersion induced by extreme tensile strain inLa2−xSrxCuO4films

“…For the fit, we have chosen an inner potential 13 ͑including the work function͒ V 0 = + ͉E 0 ͉ in the interval 10-14 eV, in agreement with the values found in the literature for similar oxides. 14,16 Both V 0 and m * were adjusted during the fitting procedure, converging to 13 eV and 1.38m e , respectively.…”