STUDY OF THE MODULATED STRUCTURE OF BI2(SR, CA)3CU2O8+GAMMA IN THE RANGE 8-K-920-K

被引：35

作者：

BESKROVNYI, AI ^{[1
]}

DLOUHA, M ^{[1
]}

JIRAK, Z ^{[1
]}

VRATISLAV, S ^{[1
]}

机构：

[1] JOINT INST NUCL RES,NEUTRON PHYS LAB,HEAD POST OFFICE,POB 79,MOSCOW 101000,USSR

来源：

PHYSICA C | 1990年 / 171卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(90)90450-S

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The 80 K superconductor Bi2(Sr,Ca)3Cu2O8+γ was investigated at room and low temperatures by single-crystal neutron diffraction and at elevated temperatures by powder diffraction. The 4.75a modulation and excess of oxygen (γ=0.21 in the ideal case) persist over the entire temperature range without marked changes. The structure can be described within the supercell 19a×b×c and the orthorhombic symmetry Pnaa. Complete structural refinement at 90 K and 55 K revealed only small changes with respect to the room-temperature structure published previously [2]. Essentially, the cation-oxygen distances which are considered as bonding are retained, while some nonbonding distances decrease. The bonding of copper within the CuO2 layer remains nearly planar in contrast with the related 93 K superconductor YBa2Cu3O7 in which the copper cations are substantially shifted out of the oxygen plane. © 1990.

引用

页码：19 / 24

页数：6

共 10 条

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