Structural phase transitions and the effect on Pr anomalous ordering for the PrBa2−xLaxCu3O7+y system

淡江大學機構典藏 > 理學院 > 化學學系暨研究所 > 期刊論文 > Item 987654321/25236

jsp.display-item.identifier=請使用永久網址來引用或連結此文件: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/25236

题名:	Structural phase transitions and the effect on Pr anomalous ordering for the PrBa2−xLaxCu3O7+y system
作者:	Ku, H. C.;Luo, H. M.;Chi, Y. P.;Lin, B. N.;Hsu, Y. Y.;Lin, C. H.;Kao, H. -C. I.
贡献者:	淡江大學化學學系
关键词:	p–f hybridization;Anomalous ordering;Structural phase transition
日期:	2000-06
上传时间:	2013-07-09 15:27:31 (UTC+8)
出版者:	Amsterdam: Elsevier BV * North-Holland
摘要:	Complex crystal symmetry variation is observed for the oxygenated PrBa2−xLaxCu3O7+y system (0⩽x⩽1, −0.12⩽y⩽0.39). Powder X-ray Rietveld analysis indicates that the crystal structure changes from the PrBa2Cu3O7 or CuBa2PrCu2O7 1212C-type (C for chain) orthorhombic O(I)-phase (space group Pmmm) to 1212-type tetragonal T-phase (P4/mmm) around x=0.45, and then to a new 1212-type of orthorhombic O(II)-phase (Cmmm) around x=0.65. However, regardless of the structural change, anomalous Pr ordering temperature TN(Pr) decreases monotonically from 18 K for PrBa2Cu3O6.88 to 2.8 K for PrBa1.3La0.7Cu3O7.24. The increasing Pr–O bond length with decreasing TN indicates that Pr ordering is closely correlated with the wave function overlap between Pr–4f orbital and O–2pπ orbital in the CuO2 bi-layers.
關聯:	Physica B: Condensed Matter 281-282, pp.892-893
DOI:	10.1016/S0921-4526(99)00784-X
显示于类别:	[化學學系暨研究所] 期刊論文

文件中的档案:

档案	描述	大小	格式	浏览次数
index.html		0Kb	HTML	182	检视/开启
Structural phase transitions and the effect on Pr anomalous ordering for the PrBa2−xLaxCu3O7+y system.pdf		96Kb	Adobe PDF	1	检视/开启

在機構典藏中所有的数据项都受到原著作权保护.

TAIR相关文章