Properties of superconducting planar resonators at millikelvin temperatures

Autor:	Tobias Lindström, C. M. Muirhead, M. S. Colclough, A. Ya. Tzalenchuk, J. E. Healey
Rok vydání:	2009
Předmět:	Superconductivity Materials science Condensed matter physics Niobium Macroscopic quantum phenomena chemistry.chemical_element Substrate (electronics) Condensed Matter Physics Electronic Optical and Magnetic Materials Resonator Planar chemistry Sapphire Center frequency
Zdroj:	Physical Review B. 80
ISSN:	1550-235X 1098-0121
DOI:	10.1103/physrevb.80.132501
Popis:	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 ${\text{SiO}}_{2}/\text{Si}$ 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f6e8cdb143923d5051cb11174647ec5e https://doi.org/10.1103/physrevb.80.132501 Zobrazit plný text záznamu