Nanotech 2005 Vol. 2
Nanotech 2005 Vol. 2
Technical Proceedings of the 2005 NSTI Nanotechnology Conference and Trade Show, Volume 2

Atomic and Mesoscale Modelling of Nanoscale Phenomena Chapter 8

Theory and Experiments on Periodic Lattice Distortions that Explain 1D Conductivity along the CuO2 Plane Ab And A-B Diagonals in YBa2Cu3O7 (YBCO) 50 nm Film with a 24 DEG Grain Boundary (Gb)

Authors: H.S. Sahibudeen, M.A. Navacerrada and J.V. Acrivos

Affilation: San Jose State University, United States

Pages: 573 - 576

Keywords: cuprates, SCF calculations, superconductivity, XRD, PLD

Abstract:
Self consistent field (SCF) calculations carried out at San José State University (using MOLECOLE Linux codes) for a nano-particle of 18 molecules of T’-Nd2CuO4 explain the dxy symmetry for preferred superconductivity in the ab plane. These indicate that 1D conductivity is induced along the ab diagonal when there is a periodic lattice distortion (PLD) at site R: uexp(i(2pR.q+f)) (measured in X-ray diffraction (XRD)) of wave vector q and amplitude u. XRD and X-ray absorption (XAS) measurements were done (at the Stanford Synchrotron Radiation Laboratory (SSRL) and at the Lawrence Berkeley National Laboratory (LBNL-ALS)) on 50 nm c-axis oriented YBCO films (deposited on single crystal SrTiO3 and bi-crystals with a 24DEG grain boundary (GB) at the Complutense University). Understanding structure and distortions of YBCO films is important for device fabrication.

Theory and Experiments on Periodic Lattice Distortions that Explain 1D Conductivity along the CuO2 Plane Ab And A-B Diagonals in YBa2Cu3O7 (YBCO) 50 nm Film with a 24 DEG Grain Boundary (Gb)

ISBN: 0-9767985-1-4
Pages: 808
Hardcopy: $109.95