Raman spectroscopy study of the interface structure in (CaCuO2)n/(SrTiO3)m superlattices

D. Di Castro; S. Caramazza; D. Innocenti; G. Balestrino; C. Marini; P. Dore; P. Postorino

doi:10.1063/1.4828358

Raman spectroscopy study of the interface structure in (CaCuO2)n/(SrTiO3)m superlattices

Superconductivity 2015-06-17 v2 Materials Science

Authors: D. Di Castro , S. Caramazza , D. Innocenti , G. Balestrino , C. Marini , P. Dore , P. Postorino

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Abstract

Raman spectra of CaCuO2/SrTiO3 superlattices show clear spectroscopic marker of two structures formed in CaCuO2 at the interface with SrTiO3. For non-superconducting superlattices, grown in low oxidizing atmosphere, the 425 cm-1 frequency of oxygen vibration in CuO2 planes is the same as for CCO films with infinite layer structure (planar Cu-O coordination). For superconducting superlattices grown in highly oxidizing atmosphere, a 60 cm-1 frequency shift to lower energy occurs. This is ascribed to a change from planar to pyramidal Cu-O coordination because of oxygen incorporation at the interface. Raman spectroscopy proves to be a powerful tool for interface structure investigation.

Keywords

raman spectroscopy superlattices interface structure CaCuO2 SrTiO3 Cu-O coordination superconductivity

Cite

@article{arxiv.1308.5616,
  title  = {Raman spectroscopy study of the interface structure in (CaCuO2)n/(SrTiO3)m superlattices},
  author = {D. Di Castro and S. Caramazza and D. Innocenti and G. Balestrino and C. Marini and P. Dore and P. Postorino},
  journal= {arXiv preprint arXiv:1308.5616},
  year   = {2015}
}

Raman spectroscopy study of the interface structure in (CaCuO2)n/(SrTiO3)m superlattices

Abstract

Keywords

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