X-RAY-DIFFRACTION AND INFRARED INVESTIGATION OF RBA(2)CU(3)O(7) AND R(0.5)PR(0.5)BA(2)CU(3)O(7) COMPOUNDS (R=Y AND LANTHANIDES)

被引：96

作者：

CHRYSSIKOS, GD ^{[1
]}

KAMITSOS, EI ^{[1
]}

KAPOUTSIS, JA ^{[1
]}

PATSIS, AP ^{[1
]}

PSYCHARIS, V ^{[1
]}

KOUFOUDAKIS, A ^{[1
]}

MITROS, C ^{[1
]}

KALLIAS, G ^{[1
]}

GAMARISEALE, E ^{[1
]}

NIARCHOS, D ^{[1
]}

机构：

[1] NCSR DEMOKRITOS,INST MAT SCI,GR-15310 ATHENS,GREECE

来源：

PHYSICA C | 1995年 / 254卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(95)00553-6

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

RBa(2)Cu(3)O(7) and [R(0.05)Pr(0.5)]Ba2Cu3O7 compounds with R=Y and lanthanides have been prepared and studied at ambient temperature by means of XRD and infrared-reflectance spectroscopy. In Pr free compounds, increasing the Shannon radius of R, r(R), leaves the puckering of the Cu(2)-O(2, 3) sheet unaffected. In the Pr containing compounds, the Pr-O coordination polyhedron is typical of R(+3) ions in eight-fold coordination and argues against differentiating Pr in terms of valence or hybridization. Instead, a repositioning of Ba within the cuprate block is observed, leading to the flattening of the sheet and the anomalously high frequency of the Ba and Cu(7)-O(2, 3) B-1u modes. In R-Pr compounds the c-axis and the interplanar distances related to the position of Pa and O(2, 3) are found to exhibit a sigmoidal dependence on r(R). It is argued that this sigmoidal dependence is related to the two-mode behavior exhibited by several phonon modes of these compounds.

引用

页码：44 / 62

页数：19

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