Pb substitution in theBi2Sr2CaCu2

Structure optimization effects on the electronic and vibrational properties ofBi2Sr2CaCuBellini1, Manghi2, Thonhauser3 et al. 2004Phys. Rev. B14470View full textAdd to dashboardCite

“…The strongest debate concerns the origin of the two highest frequencies, i.e., at around 460 and 630 cm Ϫ1 , which were attributed to the motion of the O Bi and O Sr atoms, [32][33][34][35][36] or vice versa. 37 Our calculations, both for the tetragonal and orthorhombic cells, give a strong support to the former type of attribution. Nevertheless, if the calculated value for the O Sr mode is reasonably close to the experimental one, a striking deviation is found for the c-axis vibration of O Bi (233 cm Ϫ1 for the tetragonal cell vs the experimental attributed value of 460 cm Ϫ1 ).…”

Electronic Raman scattering in disorderedBi2Sr2Ca(Misochko1, Gu2 1999Phys. Rev. B

“…The B 1g peak dropped sharply in the Pb-substituted samples, while the A 1g peak remained unchanged. 11 The B 1g channel for the Fe-substituted samples shows a more complicated behavior than expected from the Devereaux theory. For the Fe concentrations not exceeding yϭ0.015, the overall spectral weight apparently reorganizes to lower frequencies, the behavior expected for a d-wave scenario, whereas for higher Fe concentrations the scattering appears to weight out to higher frequencies.…”

Hole doping in Pb-free and Pb-substituted(Bi,Pb)2Sr2Karppinen1, Lee2, Lee3 et al. 2003Phys. Rev. B20150View full textAdd to dashboardCite

“…So far rather intuitively it has been assumed that Pb enters the Bi-22(nϪ1)n phases as divalent and therefore Pb substitution for trivalent Bi increases the concentration of holes in the CuO 2 planes. [8][9][10][11] For this intuitive view a further assumption has been made that the oxygen content remains unchanged upon Pb substitution. In this work we combine two complementary analysis techniques, i.e., x-ray-absorption near-edge structure ͑XANES͒ spectroscopy and coulometric redox titration, to show that the very simple intuitive view does not hold true for ͑Bi,Pb͒-2223.…”