SURVEY OF MICROWAVE SURFACE IMPEDANCE DATA OF HIGH-TC SUPERCONDUCTORS - EVIDENCE FOR NONPAIRING CHARGE-CARRIERS

被引：59

作者：

MULLER, G

KLEIN, N

BRUST, A

CHALOUPKA, H

HEIN, M

ORBACH, S

PIEL, H

RESCHKE, D

机构：

[1] Fachbereich Physik, Bergische Universität, Wuppertal 1

[2] Fachbereich Elektrotechnik, Bergische Universität, Wuppertal 1

来源：

JOURNAL OF SUPERCONDUCTIVITY | 1990年 / 3卷 / 03期

关键词：

microwave; penetration depth; surface resistance; two-fluid model; YBa[!sub]2[!/sub]Cu[!sub]3[!/sub]O[!sub]7-δ[!/sub;

D O I：

10.1007/BF00625263

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The microwave surface impedance of the high-Tc oxide superconductors has been measured at many laboratories around the world. A survey of their data between 100 MHz and 150 GHz for polycrystalline as well as single crystalline samples is given, focusing on YBa2Cu3O7-δ. In comparison to the classical superconductors, these results reveal a very similar temperature dependence of the surface impedance close to Tc but an anomalous high residual surface resistance at lower temperatures. Both features can be explained by the assumption that oxide superconductors contain a significant number of nonpairing charge carriers. Within the framework of a properly extended two-fluid model, this is shown by analysis of our best thin-film data. Moreover, the enhanced losses in polycrystalline material especially for superposed magnetostatic fields result, to a large extent, from the deeper penetration depth. The possible origin of the nonpairing charge carriers and their impact on the applicability of the oxide superconductors is briefly discussed. © 1990 Plenum Publishing Corporation.

引用

页码：235 / 242

页数：8

共 25 条

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