Anomalous Pr Ordering and Structural Analysis for Oxygenated Tetragonal 1212 Compound Pr1.5Ba1.5Cu3O7.2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

Anomalous Pr Ordering and Structural Analysis for Oxygenated Tetragonal 1212 Compound Pr1.5Ba1.5Cu3O7.2

Authors:	H. C. Ku H. M. Luo Y. P. Chi B. N. Lin Y. Y. Hsu T. J. Lee J. B. Shi H.-C. I. Kao

Affiliation:	(1) Department of Physics, National Tsing Hua University, Hsinchu, 300, Taiwan;(2) Department of Electronic Engineering, Feng Chia Univ., Taichung, 407, Taiwan;(3) Department of Chemistry, Tamkang University, Tamsui, 251, Taiwan

Abstract:	Magnetic measurement and powder X-ray Rietveld analysis are performed on oxygenated Pr_1.5Ba_1.5Cu₃O_7.2cuprate. This tetragonal compound with lattice parameters a = 0.38916 nm and c = 1.16177 nm is found to form the TlBa₂CaCu₂O₇1212-type structure when written as Cu[Ba_1.5Pr_0.5]PrCu₂O_7.2. Low temperature magnetic data indicate that anomalous Pr order temperature T_N(Pr) decreases from 18 K for orthorhombic PrBa₂Cu₃O_6.9to 10.5 K for Pr_1.5Ba_1.5Cu₃O_7.2. The increasing Pr-O bond length with decreasing T_Nindicates that Pr ordering is closely correlated with the wave function overlap between Pr-4f orbital and O-2porbital in the CuO₂bi-layers.

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