Nuclear quadrupole interactions and charge localization in HgBa2CuO4+δ with different oxygen content

A. A. Gippius, E. V. Antipov, W. Hoffmann, K. Lüders

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26 Citations (Scopus)

Abstract

Variation of the oxygen content 5 in HgBa2CuO4+δ (Hg-1201) provides a good opportunity to study the influence of oxygen doping on nuclear quadrupole interactions (NQI) and charge localisation in different regions of the (Tc-δ) phase diagram. We performed 63,65Cu Nuclear Quadrupole Resonance (NQR) studies on a series of HgBa2CuO4+δ samples with different oxygen content δ. Based on the experimental NQR spectra of the Hg-1201 compounds and the known copper NQR frequency for the undoped Nd2CuO4 a phenomenological method is developed to analyze the NQI in high temperature superconductors (HTSC) including both, the on-site electric field gradient (EFG) and the lattice contribution in the EFG. Using this method we estimated the Stemheimer antishielding factor γ = - 16.2 for Cu2+ and the hole concentration nx2-y2 on the copper 3dx2-y2 orbital. The nx2-y2 value rises monotonously with increasing doping level over the whole Hg-1201 sample series and is the main factor causing the increase of quadrupole frequency νQ. No saturation effect on the copper hole doping process has been found at high oxygen content level.

Original languageEnglish
Pages (from-to)57-64
Number of pages8
JournalPhysica C: Superconductivity and its Applications
Volume276
Issue number1-2
DOIs
Publication statusPublished - 1 Mar 1997
Externally publishedYes

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