SR-INDUCED OXYGEN DEFECTS IN LA2-XSRXCUO4-DELTA - A NEUTRON POWDER DIFFRACTION STUDY

被引：48

作者：

KAMIYAMA, T

IZUMI, F

ASANO, H

TAKAGI, H

UCHIDA, S

TOKURA, Y

TAKAYAMAMUROMACHI, E

MATSUDA, M

YAMADA, K

ENDOH, Y

HIDAKA, Y

机构：

[1] NATL INST RES INORGAN MAT,TSUKUBA,IBARAKI 305,JAPAN

[2] UNIV TOKYO,ENGN RES INST,BUNKYO KU,TOKYO 113,JAPAN

[3] UNIV TOKYO,DEPT PHYS,BUNKYO KU,TOKYO 113,JAPAN

[4] TOHOKU UNIV,DEPT PHYS,AOBA KU,SENDAI,MIYAGI 980,JAPAN

[5] NTT APPL ELECTR LABS,IBARAKI 31911,JAPAN

来源：

PHYSICA C | 1990年 / 172卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(90)90649-Y

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The validity of Sr-induced oxygen-defect structure in La(2-x)Sr(x)CuO4-delta-claimed by Tan et al. was judged by the Rietveld analysis of TOF neutron powder diffraction data of La(2-x)Sr(x)CuO4-delta-(x = 0, 0.11, 0.15, 0.3 and 0.6); both oxidized and reduced samples were used for the composition x = 0.11. The samples with x = 0.15, 0.3 and 0.6 were tetragonal (14/mmm) at room temperature, while La2CuO4-delta at room temperature and La1.89Sr0.11CuO4-delta at 115 K were orthorhombic (Cmca). No interstitial oxygen trapped near Sr could be detected in any of the samples. In La1.4Sr0.6CuO4-delta, an equatorial oxygen site is 8% deficient, and the distance between Cu and apical oxygen is as short as 2.337-angstrom, which is ascribed to the formation of oxygen defects related structurally Sr2CuO3.

引用

页码：120 / 126

页数：7

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