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首页> 外文期刊>Physica, B. Condensed Matter >Effect of Ag admixture on the electron localization mechanism in the normal state of dip-coated YBa2Cu3O7-delta thick films
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Effect of Ag admixture on the electron localization mechanism in the normal state of dip-coated YBa2Cu3O7-delta thick films

机译：Ag掺杂对浸涂YBa2Cu3O7-δ厚膜常态下电子局部化机理的影响

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摘要

The effects of superconducting grain boundary disorder on the normal-state transport properties of cuprate films was investigated. Dip-coated granular YBa2Cu3O7-delta (YBaCuO) thick films on polycrystalline MgO substrates were synthesized and networked grains were systematically made less disordered in order to probe the cross-over from strong to weak inter-grain (between grains) disorder. Grain boundary passivation was achieved by AgNO3 metallic inclusions. The normal state of samples was shown to exhibit a semi-conducting behaviour and then changes to metallic with sharper transitions to the superconducting state as the grain-interfaces disorder is decreased, i.e. increase metallic inclusion content. The normal-state conductivity is thus shown to undergo a dimensional cross-over from 3D to 2D in the frame of the variable range-hopping regime. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 9]
机译：研究了超导晶界无序对铜酸盐薄膜正常态输运性能的影响。合成了在多晶MgO衬底上浸涂的颗粒状YBa2Cu3O7-δ（YBaCuO）厚膜，并系统地减少了网状晶粒的无序度，以探究从强晶粒到弱晶粒（晶粒间）无序的交叉。 AgNO3金属夹杂物可实现晶界钝化。样品的正常状态显示出半导电行为，然后随着晶粒界面紊乱的减少（即增加金属夹杂物含量）而转变为金属，并以更陡峭的过渡态转变为超导状态。因此，在可变范围跳跃方式的框架内，正常状态的电导率显示出从3D到2D的尺寸转换。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：9]

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