Properties of superconducting planar resonators at millikelvin temperatures

被引：55

作者：

Lindstroem, T. ^{[1
,2
]}

Healey, J. E. ^{[1
]}

Colclough, M. S. ^{[1
]}

Muirhead, C. M. ^{[1
]}

Tzalenchuk, A. Ya. ^{[2
]}

机构：

[1] Univ Birmingham, Birmingham B15 2TT, W Midlands, England

[2] Natl Phys Lab, Teddington TW11 0LW, Middx, England

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 13期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1103/PhysRevB.80.132501

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Planar superconducting resonators are now being increasingly used at mK temperatures in a number of novel applications. We have experimentally investigated three types of niobium resonators including a lumped-element design fabricated on sapphire and SiO2/Si substrates. They all exhibit a nonmonotonic temperature dependence of their center frequency which could be accurately described by resonant absorption by two-level fluctuators (TLF). By analyzing the temperature dependence we extracted information about the distribution of TLF. Our results are consistent with there being a spread of TLF at the interface between superconductor and substrate.

引用

页数：4

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