Structural phase transitions and the effect on Pr anomalous ordering for the PrBa2−xLaxCu3O7+y system
學年 88
學期 2
出版（發表）日期 2000-06-01
作品名稱 Structural phase transitions and the effect on Pr anomalous ordering for the PrBa2−xLaxCu3O7+y system
作品名稱（其他語言）
著者 Ku, H. C.; Luo, H. M.; Chi, Y. P.; Lin, B. N.; Hsu, Y. Y.; Lin, C. H.; Kao, H. -C. I.
單位 淡江大學化學學系
出版者 Amsterdam: Elsevier BV * North-Holland
著錄名稱、卷期、頁數 Physica B: Condensed Matter 281-282, pp.892-893
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.
關鍵字 p–f hybridization;Anomalous ordering;Structural phase transition
語言 en
ISSN 0921-4526
期刊性質 國外
收錄於 SCI
產學合作
通訊作者 Ku, H. C.
審稿制度
國別 NLD
公開徵稿
出版型式 紙本
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