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Journal of Superconductivity and Novel Magnetism

, Volume 26, Issue 8, pp 2597–2601 | Cite as

Effects of Excess or Deficiency of Oxygen Content on the Electronic Structure of High-T c Cuprates

  • T. Jarlborg
  • A. Bianconi
  • B. Barbiellini
  • R. S. Markiewicz
  • A. Bansil
Original Paper

Abstract

Band structure calculations are presented for large supercells of Ba2CuO4 (BCO) with O-vacancies in planar or apical positions, and of superoxygenated La2CuO4 (LCO) with oxygen interstitials in the La2O2 layers. It is found that apical oxygen vacancies in BCO act as electron dopants and makes the electronic structure similar to that of hole doped LCO. Excess oxygen interstitials forming wires in the La2O2 layers of LCO are shown to yield a much larger density-of-states at the Fermi energy than for the stoichiometric compound related with a segmentation of the Fermi surface. Antiferromagnetic (AFM) spin fluctuations are strengthened by O-vacancies in BCO as well as by oxygen interstitials in LCO, but are strongly suppressed in O-deficient LCO. Our results indicate the complexity of doping by O-vacancies, and by ordered defects that are a significant factor controlling the electronic properties of cuprates.

Keywords

Cuprates Electronic structure Oxygen defects 

Notes

Acknowledgements

This work is supported by the US Department of Energy contract number DE-FG02-07ER46352, and benefited from the allocation of supercomputer time at the NERSC and Northeastern University’s Advanced Scientific Computation Center (ASCC).

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • T. Jarlborg
    • 1
  • A. Bianconi
    • 2
  • B. Barbiellini
    • 3
  • R. S. Markiewicz
    • 3
  • A. Bansil
    • 3
  1. 1.DPMCUniversity of GenevaGeneva 4Switzerland
  2. 2.RICMASSRome International Center for Materials Science SuperstripesRomeItaly
  3. 3.Department of PhysicsNortheastern UniversityBostonUSA

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