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

被引：8
|
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.
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页数：5
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