RAMAN-SCATTERING STUDY OF SITE SUBSTITUTION IN RE1+XBA2-XCU3O7-DELTA (RE = PR, LA)

被引：12

作者：

REN, YT ^{[1
]}

XUE, YY ^{[1
]}

SUN, YY ^{[1
]}

CHU, CW ^{[1
]}

机构：

[1] UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204

来源：

PHYSICA C | 1993年 / 213卷 / 1-2期

基金：

美国国家科学基金会; 美国国家航空航天局;

关键词：

D O I：

10.1016/0921-4534(93)90781-K

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Several samples Of PrBa2Cu3O6.97, Pr1+xBa2-xCu3O7-delta and La1+xBa2-xCu3O7-delta have been synthesized and examined by X-ray diffraction and polarized micro-Raman scattering. The X-ray diffraction refinement results on these samples show a decrease of the Cu(2)-0(4)-Cu ( 1 ) bond length due to partial Ba-site substitution by large radius RE-ions. The Raman scattering shows an increase of the apical 0(4) stretching frequency in agreement with the structure data. The increasing of the 0(4) vibration frequency with the rare-earth induced bond-length changes can account for previous seemingly contradictory Raman results on PrBa2Cu3O7. An empirical relation was found between the effective force constant k for 0 (4) and the Cu ( 1 ) -Cu (2) spacing d: k is-proportional-to d-6. The oxygen disorder induced peak at approximately 600 cm-1 is also discussed.

引用

页码：224 / 228

页数：5

共 22 条

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