Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: K1.00216 : Sun Oven Grown Cuprates Superconductivity and Periodic Lattice Distortions PLD
Author:
Bi$_{1.7}$Pb$_{0.3}$Sr$_{2}$Ca$_{n-1}$Cu$_{n}$O$_{4+2n+\delta }$
identified
by the layer heavy element composition with substitution, s
(2$_{s}$:2:n-1:n\underline {$>$}2) cuprates grown by green
chemistry,
transition temperatures to superconductivity T$_{c}$=87 to 150K
are related
to their structure. Enhanced XRD at energies near but below the
Cu K, and Pb
and Bi L3-edges for pure n=2, 3 phases show Darwin shaped
preferred [HKL]
reflections that identify the magnitude of the allowed transition
moment
from the core state to extended unoccupied states determined by
the electron
density symmetry in that plane, confirmed by XAS of 3$\mu $m
thick films.
Weak PLD are still detected, but the stability gained by
substitution of Bi
by Pb is the formation of nearly symmetric Pb$_{8}$ cubes in
(2$_{s}$:2:1:2)$_{13 }$and (2$_{s}$:2:2:3)$_{17}$ super-lattices.
The
preferred 2D [HKL] reflection planes play the same role in the
chemical
activity of 3D solids as the linear bonds do in molecular reactions,
governed by scattering dependent on the electron density symmetry
in their
highest and lowest unoccupied states.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.K1.216
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