$Pb_{0.4}Bi_{1.6}Sr_{2}Ca_{1}Cu_{2}O_{8+x}$ and Oxygen Stoichiometry: Structure, Resistivity, Fermi Surface Topology and Normal State Properties

Jian Ma; P. Alméras; R. J. Kelley; H. Berger; G. Margaritondo; X. Y. Cai; Y. Feng; D. Larbalestier; M. Onellion

doi:10.1103/physrevb.51.9271

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$Pb_{0.4}Bi_{1.6}Sr_{2}Ca_{1}Cu_{2}O_{8+x}$ and Oxygen Stoichiometry: Structure, Resistivity, Fermi Surface Topology and Normal State Properties

Jian Ma·P. Alméras·R. J. Kelley·H. Berger·G. Margaritondo·X. Y. Cai·Y. Feng·D. Larbalestier·M. Onellion

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Abstract

$Pb_{0.4}Bi_{1.6}Sr_2CaCu_2O_{8+x}$ ($Bi(Pb)-$2212) single crystal samples were studied using transmission electron microscopy (TEM), $ab-$plane ($ρ_{ab}$) and $c-$axis ($ρ_c$) resistivity, and high resolution angle-resolved ultraviolet photoemission spectroscopy (ARUPS). TEM reveals that the modulation in the $b-$axis for $Pb(0.4)-$doped $Bi(Pb)-$2212 is dominantly of $Pb-$type that is not sensitive to the oxygen content of the system, and the system clearly shows a structure of orthorhombic symmetry. Oxygen annealed samples exhibit a much lower $c-$axis resistivity and a resistivity minimum at $80-130$K. He-annealed samples exhibit a much higher $c-$axis resistivity and $dρ_c/dT<0$ behavior below 300K. The Fermi surface (FS) of oxygen annealed $Bi(Pb)-$2212 mapped out by ARUPS has a pocket in the FS around the $\bar{M}$ point and exhibits orthorhombic symmetry. There are flat, parallel sections of the FS, about 60\% of the maximum possible along $k_x = k_y$, and about 30\% along $k_x = - k_y$. The wavevectors connecting the flat sections are about $0.72(π, π)$ along $k_x = k_y$, and about $0.80(π, π)$ along $k_x = - k_y$, rather than $(π,π)$. The symmetry of the near-Fermi-energy dispersing states in the normal state changes between oxygen-annealed and He-annealed samples.

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Jian Ma, P. Alméras, R. J. Kelley, H. Berger, G. Margaritondo, X. Y. Cai, Y. Feng, D. Larbalestier, M. Onellion. 1994-10-19. $Pb_{0.4}Bi_{1.6}Sr_{2}Ca_{1}Cu_{2}O_{8+x}$ and Oxygen Stoichiometry: Structure, Resistivity, Fermi Surface Topology and Normal State Properties. https://doi.org/10.1103/physrevb.51.9271

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