Infrared vortex-state electrodynamics in type-II superconducting thin films

被引：9

作者：

Xi, Xiaoxiang ^{[1
,2
]}

Park, J. -H. ^{[3
]}

Graf, D. ^{[3
]}

Carr, G. L. ^{[2
]}

Tanner, D. B. ^{[1
]}

机构：

[1] Univ Florida, Dept Phys, Gainesville, FL 32611 USA

[2] Brookhaven Natl Lab, Upton, NY 11973 USA

[3] Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA

来源：

PHYSICAL REVIEW B | 2013年 / 87卷 / 18期

关键词：

MICROWAVE SURFACE IMPEDANCE; PARAMAGNETIC IMPURITIES; METALLIC-FILMS; MIXED-STATE; VORTICES; FIELD; CONDUCTIVITY; TEMPERATURE; DEPENDENCE; FREQUENCY;

D O I：

10.1103/PhysRevB.87.184503

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The vortex-state electrodynamics of s-wave superconductors has been studied by infrared spectroscopy. Far-infrared transmission and reflection spectra of superconducting Nb0.5Ti0.5N and NbN thin films were measured in a magnetic field perpendicular to the film surface, and the optical conductivity was extracted. The data show clear reduction of superconducting signature. We consider the vortex state as a two-component effective medium of normal cores embedded in a BCS superconductor. The spectral features are well explained by the Maxwell Garnett theory. Our analysis supports the presence of magnetic-field-induced pair-breaking effects in the superconducting component outside of the vortex cores.

引用

页数：5

共 35 条

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