CHARACTERIZATION AND STRUCTURAL-ANALYSIS OF TWINNED LA2-XSRXCUO4+/-DELTA CRYSTALS BY NEUTRON-DIFFRACTION

被引：38

作者：

BRADEN, M

HEGER, G

SCHWEISS, P

FISK, Z

GAMAYUNOV, K

TANAKA, I

KOJIMA, H

机构：

[1] KERNFORSCHUNGSZENTRUM KARLSRUHE GMBH,INST NUKL FESTKORPERPHYS,W-7500 KARLSRUHE 1,GERMANY

[2] YAMANASHI UNIV,INST INORGAN SYNTH,KOFU,YAMANASHI 400,JAPAN

[3] MOSCOW GEN PHYS INST,MOSCOW 182,USSR

[4] UNIV COLOGNE,INST PHYS 2,W-5000 COLOGNE 41,GERMANY

[5] UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545

来源：

PHYSICA C | 1992年 / 191卷 / 3-4期

关键词：

D O I：

10.1016/0921-4534(92)90944-8

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The microstructure of La2-xSrxCuO4 +/- delta crystals has been studied by neutron diffraction. Profile analysis of the intensity of Bragg reflections shows that the large crystals consist of domains of four different orientations, which are related to the symmetry reduction of the phase transition I4/mmm-Abma. The domain structure has a strong influence on the extinction, therefore it may be studied macroscopically. The microstructure is formed at the phase transition and does not change in the orthorhombic phase. After a first cooling cycle the formation of the domains appears to be reversible without a temperature hysteresis. The same domain structure appears in consecutive cooling cycles. This indicates a pinning of the domain structure by lattice defects. A data set of Bragg reflection intensities obtained on a twinned La1.93Sr0.07CuO4 crystal at room temperature could be refined with special consideration of the microtwinning. The achieved precision of structural parameters is almost comparable to structural analyses on monodomain single crystals.

引用

页码：455 / 468

页数：14

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