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Competition between composite and modulated configurations in Bi2Sr2CaCu2O8+δ and its relation to oxygen stoichiometry

MPS-Authors
/persons/resource/persons280235

Liang,  B.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;
Scientific Facility Crystal Growth (Masahiko Isobe), Max Planck Institute for Solid State Research, Max Planck Society;

/persons/resource/persons280238

Lin,  C. T.
Scientific Facility Crystal Growth (Masahiko Isobe), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Perez-Mato, J. M., Etrillard, J., Kiat, J. M., Liang, B., & Lin, C. T. (2003). Competition between composite and modulated configurations in Bi2Sr2CaCu2O8+δ and its relation to oxygen stoichiometry. Physical Review B, 67(2): 024504.


Cite as: https://hdl.handle.net/21.11116/0000-000E-E9D3-D
Abstract
The possible interpretation of the compound Bi2Sr2CaCu2O8+delta
as a composite or a single modulated incommensurate structure
is deeply interconnected with the existence of discontinuous
atomic domains in the superspace description of the structure.
Single-crystal neutron diffraction data have been used to
obtain Fourier maps within the superspace description, which
show that some atomic domains are indeed either discontinuous,
like that of the atoms in the BiO layers, or strongly
anharmonic. This contrasts with the structural models of this
material, which usually consider a single modulated
incommensurate structure with continuous modulations containing
a few harmonics. The results demonstrate that these models are
bound to yield unrealistic configurations for the so-called
bridging zones in the BiO layers. The intrinsic discontinuous
features of the atomic modulations, especially the longitudinal
sawtooth modulations of the oxygens in the Bi2O2 slabs, are
shown to be the signature of two competing length scales
corresponding to the Bi2O2 slabs and the perovskite blocks
Sr2CaCu2O6. In principle, this feature can be naturally
included in a modulated composite description with occupational
steplike modulations. An ideal composite configuration can be
also proposed as a reference structure for describing the
effects of the strong coupling between the Bi2O2 slabs and the
perovskite blocks Sr2CaCu2O6, including its effect on the
compound stoichiometry, in particular its oxygen content.