Copper NQR study of the La 214 system from an aspect of microscopic environment of copper期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Copper NQR study of the La 214 system from an aspect of microscopic environment of copper

Authors:	K. Yoshimura T. Uemura M. Kato K. Kosuge T. Imai H. Yasuoka

Affiliation:	(1) Department of Chemistry, Faculty of Science, Kyoto University, 606-01 Kyoto, Japan;(2) Institute for Solid State Physics, University of Tokyo, Roppongi, 106 Tokyo, Japan;(3) Present address: Department of Physics, University of Illinois at Urbana-Champaign, 61801 Urbana, IL, USA

Abstract:	The nuclear quadrupole resonance (NQR) has been investigated for Cu in La_2–xA_xCuO_y (A=Sr and Ba). Three Cu NQR lines, A, B and C, have been observed, which correspond to three different Cu sites. From the analysis of these NQR intensities, site assignments are possibly as follows. These lines A, B and C are attributed to CuO₆ octahedral, CuO₅ pyramidal and CuO₄ planar sites, respectively. The apical oxygen O(2) is induced to transfer to the interstitial O(3) site between LaO planes when two or more Sr²⁺ ions are located in its neighboring La sites. The excess holes doped into the CuO₂ plane are provided mainly by O(3) as well as the unpaired Sr²⁺ ion.

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