首页|Disorder effects in NbTiN superconducting resonators

Disorder effects in NbTiN superconducting resonators

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Disordered superconducting materials like NbTiN possess a high kinetic inductance fraction and an adjustable critical temperature,making them a good choice for low-temperature detectors.Their energy gap(4),critical temperature(Tc),and quasiparticle density of states(QDOS)distribution,however,deviate from the classical BCS theory due to the disorder effects.The Usadel equation,which takes account of elastic scattering,non-elastic scattering,and electro-phonon coupling,can be applied to explain and describe these deviations.This paper presents numerical simulations of the disorder effects based on the Usadel equation to investigate their effects on the Δ,Tc,QDOS distribution,and complex conductivity of the NbTiN film.Furthermore,NbTiN superconducting resonators with coplanar waveguide(CPW)structures are fabricated and characterized at different temperatures to validate our numerical simulations.The pair-breaking parameter α and the critical temperature in the pure state TcP of our NbTiN film are determined from the experimental results and numerical simulations.This study has significant implications for the development of low-temperature detectors made of disordered superconducting materials.

effects of disorderNbTiNsuperconducting filmUsadel equationcomplex conductivitysuper-conducting resonator

吕伟涛、支强、胡洁、李婧、史生才

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Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210034,China

GEPI,Observatoire de Paris,PSL Université,CNRS,Paris 75014,France

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaChinese Academy of Sciences Program

1192530412020101002GJJSTD20210002

2024

10.1088/1674-1056/ad03dc

中国物理B(英文版)
中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI
影响因子：0.995
ISSN：1674-1056
年,卷(期)：2024.33(2)
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