Strongly Disordered TiN and NbTiN s-Wave Superconductors Probed by Microwave Electrodynamics

被引：112

作者：

Driessen, E. F. C. ^{[1
]}

Coumou, P. C. J. J. ^{[1
]}

Tromp, R. R. ^{[1
]}

de Visser, P. J. ^{[1
,2
]}

Klapwijk, T. M. ^{[1
]}

机构：

[1] Delft Univ Technol, Kavli Inst Nanosci, NL-2628 CJ Delft, Netherlands

[2] SRON Netherlands Inst Space Res, NL-3584 CA Utrecht, Netherlands

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 10期

关键词：

METAL-INSULATOR-TRANSITION; SPIN FLUCTUATIONS; TEMPERATURE; FILMS; SYSTEMS; STATES;

D O I：

10.1103/PhysRevLett.109.107003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We probe the effects of strong disorder (2.4 < k(F)l < 8.6) on superconductivity in thin films of niobium titanium nitride and titanium nitride by measuring the microwave electrodynamics in coplanar waveguide resonators. We find a gradual evolution of the electromagnetic response with disorder, deviating from BCS theory, for both materials. This result can be understood as due to changes in the quasiparticle density of states, induced by the short elastic scattering length. The observations are consistent with a model using an effective pair breaker, dependent on the level of disorder.

引用

页数：5

共 29 条

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