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Charge transfer in YBCO under pressure with bond valence sum approach

Mohammadizadeh, M. R ; Sharif University of Technology | 2005

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  1. Type of Document: Article
  2. DOI: 10.1007/s10948-005-3386-3
  3. Publisher: 2005
  4. Abstract:
  5. The bond valence sum method has been developed to high pressures considering B0(p) for calculating the valences of atoms. This approach has the advantages of finding a universal B0(P) for all the atoms -at least in YBCO, ability to evaluate the valency of each atom, and charge neutrality requirement of the unit cell. As a result, a new structural refinement has led to a more exact structural detail. The position of apical oxygen is found to be specially crucial for hole distribution between the superconducting CuO2 planes and Cu-O charge reservoir chains. Under pressure, the hole concentration in CuO2 planes increases, but in the Cu-O chains decreases, consistent with the pressure induced charge transfer model in HTSC. Our results resolve the anomalous behavior dTc/dp in YBCO. © 2005 Springer Science+Business Media, Inc
  6. Keywords:
  7. Charge transfer ; Electric conductivity ; High pressure effects ; Neutron diffraction ; Oxide superconductors ; Single crystals ; X ray diffraction ; Bond valence sum ; Ceramic superconductors ; Hole distribution ; Pressure induced charge transfer (PICT) ; Yttrium barium copper oxides
  8. Source: Journal of Superconductivity and Novel Magnetism ; Volume 18, Issue 2 , 2005 , Pages 299-307 ; 15571939 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s10948-005-3386-3