Two electronically distinct copper sites in La2-xSrxCuO4-δ compounds for 0.10 ≤ x ≤ 0.20

Mark A. Kennard, Kenneth R Poeppelmeier, Kenneth R. Poeppelmeier, W. P. Halperin

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Abstract

We report copper NQR and NMR measurements performed on the series La2-xSrxCuO4 (0.10 ≤ x ≤ 0.20). For each composition, two distinct sites of copper were observed. The relative occupation of the two sites correlates well with strontium doping. Transverse NMR shifts (H ⊥ c) of the two copper sites were derived from the NMR and NQR spectra. The temperature dependence of the 63Cu NMR frequency shifts are identical for both sites, indicating that they have the same electronic spin susceptibility and hyperfine fields, and both are in the superconducting phase having the same critical temperature. However, these two sites have distinct orbital frequency shifts and electric field gradients.

Original languageEnglish
Pages (from-to)672-677
Number of pages6
JournalChemistry of Materials
Volume3
Issue number4
Publication statusPublished - 1991

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ASJC Scopus subject areas

  • Materials Chemistry
  • Materials Science(all)

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