EFFECT OF COMPOSITION AND OXYGEN-CONTENT ON THE MICROWAVE PROPERTIES OF EVAPORATED Y-BA-CU-O THIN-FILMS

被引：44

作者：

CHEW, NG ^{[1
]}

EDWARDS, JA ^{[1
]}

HUMPHREYS, RG ^{[1
]}

SATCHELL, JS ^{[1
]}

GOODYEAR, SW ^{[1
]}

DEW, B ^{[1
]}

EXON, NJ ^{[1
]}

HENSEN, S ^{[1
]}

LENKENS, M ^{[1
]}

MULLER, G ^{[1
]}

ORBACHWERBIG, S ^{[1
]}

机构：

[1] BERG UNIV GESAMTHSCH WUPPERTAL,D-42097 WUPPERTAL,GERMANY

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 1995年 / 5卷 / 02期

关键词：

D O I：

10.1109/77.402769

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Thin films of YBa2Cu3O7-x have been grown by electron beam evaporation of the metals in the presence of atomic oxygen, with small systematic variations in cation composition. Films grown close to the stoichiometric composition or with excess yttrium are smooth while those with excess barium are substantially rougher. The effect of these differences in cation composition on both microwave and dc properties is dominated by the associated large changes in film morphology. This determines the oxygenation state, and hence the electrical properties, of the superconductor both in the as-grown state and after annealing in a furnace or with atomic oxygen. For all films a strong correlation is found between penetration depth, resistivity and c-lattice parameter which all decrease with increasing oxygen content. In our standard growth regime and at higher oxygen contents the films are overdoped and T-c falls with increasing oxygen content.

引用

页码：1167 / 1172

页数：6

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