New aspects of microwave properties of Nb in the mixed state

被引：19

作者：

Pompeo, N. ^{[1
,2
]}

Silva, E. ^{[1
,2
,3
]}

Sarti, S. ^{[4
]}

Attanasio, C. ^{[5
,6
]}

Cirillo, C. ^{[5
,6
]}

机构：

[1] Univ Roma Tre, Dipartimento Fis E Amaldi, I-00146 Rome, Italy

[2] Univ Roma Tre, Unita CNISM, I-00146 Rome, Italy

[3] CNR INFM Salerno, Lab Reg SuperMat, I-84081 Baronissi, Italy

[4] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[5] Univ Salerno, CNR INFM Salerno, Lab Reg SuperMat, I-84081 Salerno, Italy

[6] Univ Salerno, Dipartimento Fis ER Caianiello, I-84081 Salerno, Italy

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2010年 / 470卷 / 19期

关键词：

Nb; Corbino disk; Surface impedance; Vortex dynamics; II SUPERCONDUCTORS; SURFACE-RESISTANCE; IMPEDANCE;

D O I：

10.1016/j.physc.2010.02.063

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We present a study of the frequency dependence of the vortex dynamics in a conventional superconductor. We have employed a swept frequency, Corbino disk technique to investigate the temperature (3.6 K - T(c)) and high-field (from H(c2)/2 to H(c2)) microwave complex resistivity in Nb thin (20-40 nm) films as a function of the frequency (1-20 GHz). We have found several previously unnoticed features: (i) a field-dependent depinning frequency in the GHz range; (ii) deviations from the accepted frequency dependence [1], that can be ascribed to some kind of vortex creep; and (iii) the presence of switching phenomena, reminiscent of vortex instabilities. We discuss the possible origin of the features here reported. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：901 / 903

页数：3

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