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High-Temperature-Superconductor Thin Films at Microwave Frequencies : Springer Tracts in Modern Physics - Matthias Hein

High-Temperature-Superconductor Thin Films at Microwave Frequencies

Springer Tracts in Modern Physics

Hardcover Published: 2nd July 1999
ISBN: 9783540656463
Number Of Pages: 394

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The book develops a comprehensive understanding of the surface impedance of the oxide high-temperature superconductors in comparison with the conventional superconductor Nb3Sn. Linear and nonlinear microwave responses are treated separately, both in terms of models, theories or numerical approaches and in terms of experimental results. The theoretical treatment connects fundamental aspects of superconductivity to the specific high-frequency properties. The experimental data review the state of the art, as reported by many international groups. The book describes further the main features of appropriate preparation, handling, mounting, and refrigeration techniques, and finally discusses possible applications in passive and active microwave devices.

Temperature and Frequency Dependent Surface Impedancep. 1
Physical Frameworkp. 1
Field Equations and Characteristic Lengthsp. 1
Surface Resistance and Surface Reactancep. 5
Effect of Finite Film Thickness and Metallic Cap Layersp. 8
Extended Two-Fluid Modelp. 10
Equivalent Circuits and Interpretation for a Homogeneous Superconductorp. 11
Interpretation for a Granular Superconductorp. 12
Scaling Lawsp. 16
Microscopic Picturep. 19
BCS Theory: Cooper Pairs, Energy Gap and Density of Statesp. 20
BCS Theory: Complex Conductivity and Surface Impedancep. 23
Non-BCS Densities of States and Consequences for the Surface Impedancep. 27
Tunneling Spectroscopy of the Density of States in Y(Yb)Ba2 Cu3O7-xp. 41
Measurements of the Surface Impedance at Linear Responsep. 43
Measurement Methodsp. 43
Characteristic Parameters of Superconducting Resonatorsp. 44
Modes of Operationp. 50
Selected Examples of Integral Measurement Systemsp. 55
Survey of Local Measurement Systemsp. 63
Surface Impedance of Nb3Sn Films on Sapphirep. 68
Properties of Nb3Sn Thin Films on Dielectric Substratesp. 69
Superconductive Properties of the Nb3Sn Films Prepared by Tin Diffusionp. 71
Effect of Film Thickness and Grain Size on the Surface Impedancep. 78
Surface Impedance of Oxide Superconductor Filmsp. 82
Granular YBa2Cu3O7-x Filmsp. 83
Epitaxial YBa2Cu3O7-x and Tl-Ba-Ca-Cu-O Filmsp. 85
Effects of Compositionp. 94
Theoretical Descriptionp. 96
Field and Power-Dependent Surface Impedancep. 103
Critical Field Levels and Corresponding Surface Impedancep. 104
Overviewp. 105
Thermodynamic and Upper Critical Fieldsp. 110
Adiabatic Superheatingp. 114
Lower Critical Fieldsp. 117
Implications of Film Thickness, Anisotropy and Unconventional Pairingp. 126
Microwave Heatingp. 130
Description of the Problemp. 132
Analytical Approachp. 136
Numerical Simulationsp. 139
Dynamic Nonlinear Surface Impedancep. 146
Dynamic (Nonequilibrium) Microwave Responsep. 146
Two-Tone Frequency Intermodulation in the Adiabatic Limitp. 150
Two-Tone Frequency Intermodulation in Dynamic Systemsp. 155
Summary: Consequences for Nb3Sn and YBa2Cu3O7-xp. 159
Anomalous Field-Effect in Superconductors: Coupled-Grain Modelsp. 159
Anomalous Field-Effect in Superconductors: Pair Breaking Effectsp. 163
Typical Field Ranges for Nb3Sn and YBCOp. 166
Measurements of the Surface Impedance at Nonlinear Responsep. 171
Microwave Field Dependence of the Surface Impedancep. 171
Phenomenological Picturep. 172
Critical Field Levels and Power-Law Behaviorp. 176
Local Measurements of the Nonlinear Surface Impedancep. 185
Survey of Data on Nb3Sn Filmsp. 194
DC Magnetic Field Dependence of the Surface Impedancep. 199
Phenomenological Description of Zs(BDC)p. 199
Flux Penetration and Surface Impedance in Perpendicular Fieldsp. 204
Surface Impedance in Parallel Fieldsp. 213
Identification of Magnetic and Thermal Field Limitations in YBCO Filmsp. 218
Identification of Magnetically Induced Nonlinearitiesp. 218
Anomalous Field Effect in YBa2Cu3O7-x Filmsp. 225
Identification of Thermally Induced Nonlinearitiesp. 231
Summaryp. 236
Technology of High-Temperature Superconducting Films and Devicesp. 239
Thin-Film Deposition Techniquesp. 239
Nb3Sn Films on Sapphire Substratesp. 240
Preparation of YBa2Cu3O7-x Filmsp. 247
Preparation of YBa2Cu3O7-x Grain Boundary Junctionsp. 260
Integration of Films into Devicesp. 264
Choice of Substrate Materials: Structural Compatibilityp. 264
Choice of Substrate Materials: Complex Permittivityp. 267
Microwave Designp. 271
Refrigerationp. 273
General Considerationsp. 273
Liquid Coolantsp. 278
Closed-Cycle Cryocoolersp. 279
Passive High-Temperature Superconducting Microwave Devicesp. 283
Basic Features of Filtersp. 283
From Resonators to Filtersp. 284
Different Types of Filter Characteristicsp. 288
Relations Between the Properties of Filters and the Constituting Resonatorsp. 296
Passive Devices Related to Resonant Elementsp. 299
Survey of Passive Microwave Device Applicationsp. 300
Remaining Challengesp. 307
Passive Devices Based on Josephson Junctionsp. 318
Unique Features of Josephson Junctions and SQUIDsp. 318
Survey of Josephson Junction Microwave Devicesp. 325
Single-Junction SQUIDs Coupled to Microwave Devicesp. 332
Appendixp. 345
Fundamental Constantsp. 345
Frequently used Abbreviations, Symbols and Definitionsp. 346
Physical Quantitiesp. 347
HTS Compounds, Substrates and Deposition Techniquesp. 348
Referencesp. 349
Subject Indexp. 391
Table of Contents provided by Publisher. All Rights Reserved.

ISBN: 9783540656463
ISBN-10: 3540656464
Series: Springer Tracts in Modern Physics
Audience: Professional
Format: Hardcover
Language: English
Number Of Pages: 394
Published: 2nd July 1999
Publisher: Springer-Verlag Berlin and Heidelberg Gmbh & Co. Kg
Country of Publication: DE
Dimensions (cm): 23.5 x 15.5  x 2.54
Weight (kg): 1.67