NONLINEAR MICROWAVE SURFACE IMPEDANCE OF PATTERNED YBA2CU3O7 THIN-FILMS

被引：23

作者：

PORCH, A ^{[1
]}

LANCASTER, MJ ^{[1
]}

HUMPHREYS, RG ^{[1
]}

CHEW, NG ^{[1
]}

机构：

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

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 1993年 / 195卷 / 1-2期

关键词：

D O I：

10.1016/0925-8388(93)90800-3

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We have patterned thin film YBa2Cu3O7-delta (YBCO) coplanar resonators to characterise the surface impedance of our films[l]. Our best film, with growth conditions optimised for good dc transport properties, yields a resonator with an unloaded quality factor in excess of 40000 at 15K and 8GHz, with a corresponding surface resistance around 25muOMEGA. The impedance is constant for microwave fields H(rf) up to 10(4)Am-1, above which it increases rapidly. This contrasts with the case of less well optimised films; although the surface resistances of these films may be less than a factor of 2 larger than those for optimised films, the non-linear effects are much more pronounced and occur at much lower microwave fields, and they are therefore less suitable for high field applications.

引用

页码：563 / 566

页数：4

共 7 条

[1] MEASUREMENTS OF THE TEMPERATURE-DEPENDENCE OF THE MAGNETIC PENETRATION DEPTH IN YBA2CU3O7-DELTA SUPERCONDUCTING THIN-FILMS [J].