Structural disorder and superconductivity suppression in NdBa2Cu3Oz (z ∼ 7)

被引：30

作者：

Petrykin, VV

Goodilin, EA

Hester, J

Trofimenko, EA

Kakihana, M

Oleynikov, NN

Tretyakov, YD

机构：

[1] Tokyo Inst Technol, Mat & Struct Lab, Yokohama, Kanagawa 2268503, Japan

[2] Moscow State Univ, Fac Chem, Inorgan Chem Div, Inorgan Mat Lab, Moscow 119899, Russia

[3] Moscow State Univ, Higher Coll, Fac Mat Sci, Moscow 119899, Russia

[4] Australian Nucl Sci & Technol Org, Menai, NSW 2234, Australia

来源：

PHYSICA C | 2000年 / 340卷 / 01期

基金：

俄罗斯基础研究基金会;

关键词：

NdBa2Cu3Oz; EXAFS; Raman scattering spectroscopy; structure refinement; structural disorder; superconductivity suppression;

D O I：

10.1016/S0921-4534(00)00368-3

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Structural features of a low-T-c nearly; stoichiometric Nd1+xBa2-xCu3Oz phase (x less than or equal to 0.05, z similar to 6.9, a = 3.897-3.899 Angstrom, b = 3.902-3.908 Angstrom, c = 11.707-11.719 Angstrom) have been investigated for the first time by XRD, EXAFS structure refinement techniques and Raman spectroscopy. It has been found that the abnormal lattice parameters and the low superconductivity transition temperature (55 K) of such a phase are related to structural disorder in the Ba and Nd sites resulting in oxygen disordering which cannot be avoided by a standard oxidation procedure. It is shown that longer annealing at high temperatures is an important factor for reducing the oxygen disordering and hence enhancing superconducting properties after oxidation. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：16 / 32

页数：17

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