Tunneling studies in a homogeneously disordered s-wave superconductor: NbN

被引：45

作者：

Chockalingam, S. P. ^{[1
]}

Chand, Madhavi ^{[1
]}

Kamlapure, Anand ^{[1
]}

Jesudasan, John ^{[1
]}

Mishra, Archana ^{[1
,3
]}

Tripathi, Vikram ^{[2
]}

Raychaudhuri, Pratap ^{[1
]}

机构：

[1] Tata Inst Fundamental Res, Dept Condensed Matter Phys & Mat Sci, Mumbai 400005, Maharashtra, India

[2] Tata Inst Fundamental Res, Dept Theoret Phys, Mumbai 400005, Maharashtra, India

[3] Indian Inst Technol, IIC, Roorkee 247667, Uttar Pradesh, India

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 09期

关键词：

electronic density of states; epitaxial layers; fluctuations in superconductors; magnesium compounds; niobium compounds; superconducting energy gap; superconducting materials; superconducting thin films; superconducting transition temperature; superconductive tunnelling; HIGH-TEMPERATURE SUPERCONDUCTORS; INSULATOR-TRANSITION; COUPLING SUPERCONDUCTORS; UNIVERSAL DEGRADATION; BI2SR2CACU2O8+DELTA; AMPLITUDE; ELECTRONS; LIMIT; GAP; TC;

D O I：

10.1103/PhysRevB.79.094509

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report the evolution of superconducting properties as a function of disorder in epitaxial NbN thin films grown on (100) MgO substrates. The effective disorder in these films encompasses a large range, with k(F)l similar to 1.38-8.77. Tunneling measurements reveal that for films with large disorder the superconducting transition temperature is not associated with a vanishing of the superconducting energy gap but with a large broadening of the superconducting density of states. Our results provide strong evidence of the loss of superconductivity via phase fluctuations in a homogeneously disordered s-wave superconductor.

引用

页数：5

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