Two Electronically Distinct Copper Sites in La2–xSrxCuO4–δCompounds for 0.10 ≤ x ≤ 0.20

Mark A. Kennard; Yiqiao Song; W. P. Halperin; Mark A. Kennard; Yiqiao Song; Kenneth R. Poeppelmeier

doi:10.1021/cm00016a021

Two Electronically Distinct Copper Sites in La_2–xSr_xCuO_4–δCompounds for 0.10 ≤ x ≤ 0.20

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

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

We report copper NQR and NMR measurements performed on the series La_2–xSr_xCuO₄(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 language	English (US)
Pages (from-to)	672-677
Number of pages	6
Journal	Chemistry of Materials
Volume	3
Issue number	4
DOIs	https://doi.org/10.1021/cm00016a021
State	Published - Jul 1 1991

ASJC Scopus subject areas

Chemistry(all)
Chemical Engineering(all)
Materials Chemistry

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10.1021/cm00016a021

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title = "Two Electronically Distinct Copper Sites in La2–xSrxCuO4–δCompounds for 0.10 ≤ x ≤ 0.20",

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.",

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AU - Song, Yiqiao

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AU - Kennard, Mark A.

AU - Song, Yiqiao

AU - Poeppelmeier, Kenneth R.

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N2 - 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.

AB - 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.

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