MICROWAVE SURFACE IMPEDANCE OF PROXIMITY-COUPLED NB/AL BILAYER FILMS

被引：26

作者：

PAMBIANCHI, MS

MAO, SN

ANLAGE, SM

机构：

[1] Center for Superconductivity Research, Department of Physics, University of Maryland, College Park

来源：

PHYSICAL REVIEW B | 1995年 / 52卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.52.4477

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The surface resistance and magnetic penetration depth in proximity-coupled superconductor/normal-metal (Nb/A1) bilayers are examined to study the electrodynamics of layered structures with spatially inhomogeneous superconducting order parameter. The effective penetration depth lambda(eff)(T) obeys Delta lambda(eff)(T) similar to T-eta, where n less than or equal to 1, at low temperatures, distinctly different from the exponential behavior of Nb. An accompanying drop in the surface resistance R(s) occurs in the same temperature range. A model of the bilayer electrodynamics explicitly including the effects of proximity coupling is developed, and the behavior of both lambda(eff) and R(s) is consistently described. We find that a treatment of coherence effects in the proximity-coupled normal-metal layer is necessary to properly describe the behavior of R(s)(T).

引用

页码：4477 / 4480

页数：4

共 28 条

[1]

Koyama T., Takezawa N., Naruse Y., Tachiki M., Physica C, 194, (1992)

[2]

Buzdin A.I., Damjanovic V.P., Simonov A. Yu., Physica C, 194, (1992)

[3]

Klemm R.A., Liu S.H., Phys. Rev. Lett., 74, (1995)

[4]

Kresin V.Z., Wolf S.A., Phys. Rev. B, 46, (1992)

[5]

Kleiner R., Muller P., Phys. Rev. B, 49, (1994)

[6]

Muller P., Proceedings of the Solid State Division, Physikalische Gesellschaft Spring 1994 Meeting, Münster, (1994)

[7]

Oda Y., Sumiyama A., Nagano H., Jpn. J. Appl. Phys., 22, (1983)

[8]

Mota A.C., Josephson Effect-Achievements and Trends, (1986)

[9]

Kanoda K., Mazaki H., Hosoito N., Shinjo T., Phys. Rev. B, 35, (1987)

[10]

Claassen J.H., Evetts J.E., Somekh R.E., Barber Z.H., Phys. Rev. B, 44, (1991)

← 1 2 3 →