NEUTRON-DIFFRACTION STUDY OF THE MODULATED STRUCTURE OF BI2SR3-XYXCU2O8+GAMMA(X-SIMILAR-TO-0.6)

被引：12

作者：

BESKROVNYI, AI

JIRAK, Z

NEVRIVA, M

SHELKOVA, IG

机构：

[1] INST PHYS, SLOVANCE 2, CS-18040 PRAGUE 8, CZECHOSLOVAKIA

[2] MOSCOW JOINT NUCL RES INST, NEUTRON LAB, MOSCOW 101000, RUSSIA

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 1993年 / 206卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(93)90697-O

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The structural modulation in Bi2Sr2.4Y0.6Cu2O8+gamma has been studied by single-crystal neutron diffraction. The observed structure, closely related to Bi2(Sr, Ca)3Cu2O8+gamma, displays characteristic Bi-O-Bi-ribbons in which an extra oxygen (gamma > 0) is inserted after each modulation period. For the present sample the period amounts to approximately 4.25a (a=5.461 angstrom, b=5.456 angstrom, c=30.48 angstrom). In contradistinction to the calcium analog there are other extra oxygen atoms between neighboring ribbons in the bismuth plane, spaced with the same period. The increased oxygen content given by gamma=0.5 (1) compensates the effect of the trivalent yttrium substitution for the alkali earths.

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页码：27 / 32

页数：6

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