MICROWAVE CONDUCTIVITY OF PATTERNED YBA2CU3O7 THIN-FILMS

被引：7

作者：

PORCH, A ^{[1
]}

POWELL, JR ^{[1
]}

LANCASTER, MJ ^{[1
]}

EDWARDS, JA ^{[1
]}

HUMPHREYS, RG ^{[1
]}

机构：

[1] DEF RES ESTAB,MALVERN WR14 3PS,WORCS,ENGLAND

来源：

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

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1109/77.402975

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：

We have used coplanar resonators to provide a sensitive measure of the ab-plane microwave complex conductivity sigma = sigma(1)f - i sigma(2) at 8 and 16 GHz of high quality, patterned thin films of YBa2Cu3O7-delta on MgO substrates, No BCS coherence effects were observed in sigma(1)(T) below T-c. Instead, we observe a broad peak centred between 40 and 50 K, which was present in all of the samples, The T dependence of the magnetic penetration depth lambda(T) = (omega mu(0) sigma(2)(T))(-1/2) also differed from that expected for a BCS superconductor in the London limit, This difference is most noticeable at low T, where instead of the usual exponential T dependence, we observe a term in T-2 for every sample, We discuss briefly the effects of sample oxygenation bn these results.

引用

页码：1987 / 1990

页数：4

共 12 条

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[4]

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