Surface impedance of YBa2Cu3O7−x thin film grain boundary Josephson junctions: Evaluation of the I
 cR
 n product

Hein, Matthias; Strupp, M.; Piel, H.; Portis, A. M.; Gross, Rudolf

doi:10.1063/1.355953

Cited by 14 publications

(8 citation statements)

References 14 publications

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“…A change of R S of sample A at 75 K < T < 80 K can be caused by the effect of low quality weak links. At 80 K < T < 90 K the R S versus T dependences are sharp, and, in accordance with [14] they could likely be described by the BCS theory [13,27].…”

Section: Temperature Dependencesupporting

confidence: 80%

“…The coupled grain model [8][9][10][11] describes intergrain contacts by an equivalent circuit consisting of a shunt resistance and a currentdependent inductance connected in parallel. Difference of the microwave field penetration depth into grains and boundaries are taken into account in the transmission line model [14]. The shunted grain model [15] is an extension to the original coupled grain model that explains more subtle effects, related to the decrease of the surface resistance in increasing microwave field.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of microwave losses in superconducting liquid phase epitaxy Y_0.7Yb_0.3Ba₂Cu₃O₇films

Nurgaliev

Purnell

et al. 2003

Supercond. Sci. Technol.

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Liquid phase epitaxy (LPE) is a prospective method for preparing high quality superconducting thick films, suitable for microwave application. In this paper, the microwave parameters of two selected LPE Y 0.7 Yb 0.3 Ba 2 Cu 3 O 7−δ thick (∼3 µm) films on single crystal MgO substrates with 77 K critical current densities 0.6 MA cm −2 and 0.08 MA m −2 were investigated between 20 and 90 K and at 2.7 GHz and 9.2 GHz. The dependence of the impedance on the microwave power level was ascribed to the effect of the weak links in the samples, and some parameters of weak links were evaluated. Cleaning the surface with 0.1 vol% Br 2 in methanol reduced the microwave losses for short etching times.

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Section: Temperature Dependencesupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Investigation of microwave losses in superconducting liquid phase epitaxy Y_0.7Yb_0.3Ba₂Cu₃O₇films

Nurgaliev

Purnell

et al. 2003

Supercond. Sci. Technol.

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“…The microwave surface resistance of grain boundaries has been investigated with special interest, as grain boundaries have been found to increase the surface resistance of high-T c films substantially (Hylton et al, 1988;Pinto et al, 1993;Hein et al, 1994;Herd et al, 1997;Kusunoki et al, 1999). Moreover, it was measured that at microwave frequencies the rf losses depend on the boundary angle.…”

Section: G Microwave Propertiesmentioning

confidence: 99%

Grain boundaries in high-Tcsuperconductors

2002

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Since the first days of high-T c superconductivity, the materials science and the physics of grain boundaries in superconducting compounds have developed into fascinating fields of research. Unique electronic properties, different from those of the grain boundaries in conventional metallic superconductors, have made grain boundaries formed by high-T c cuprates important tools for basic science. They are moreover a key issue for electronic and large-scale applications of high-T c superconductivity. The aim of this review is to give a summary of this broad and dynamic field. Starting with an introduction to grain boundaries and a discussion of the techniques established to prepare them individually and in a well-defined manner, the authors present their structure and transport properties. These provide the basis for a survey of the theoretical models developed to describe grain-boundary behavior. Following these discussions, the enormous impact of grain boundaries on fundamental studies is reviewed, as well as high-power and electronic device applications. CONTENTS I. Introduction 485 II. Introduction to Grain Boundaries 486 III. Preparation of Single Grain Boundaries 488 A. Bicrystalline junctions 489 B. Biepitaxial junctions 489 C. Step-edge junctions 491 IV. Structural Properties 491 V. Transport Properties of Grain Boundaries 496 A. Current-voltage characteristics 496 B. Critical current density 498 1. Dependence on grain-boundary angle 498 2. Temperature dependence of the critical currents 502 3. Magnetic-field dependence of the critical currents 502 C. Current-phase relation 504 D. Normal-state resistivity 504 E. The I c R n product 505 F. Grain-boundary capacitance 506 G. Microwave properties 507 H. Grain-boundary noise 507 I. Self-generated magnetic flux 509 J. Penetration of magnetic flux into grain boundaries 510 VI. Effects of Doping 510 VII. Grain-Boundary Mechanisms 511 A. Mechanisms based on structural properties 511 B. Mechanisms based on deviations from ideal stoichiometry 512 C. Order-parameter symmetry-based mechanisms 514 D. Interface charging and band bending 515 E. Mechanisms based on direct suppression of the pairing mechanism 516 VIII. Control of Grain Boundaries with Electric Fields or Quasiparticle Injection 517 A. Applied electric fields 517 B. Quasiparticle injection 518 IX. Irradiation of Grain Boundaries 518 A. Irradiation with electrons 518 B. Irradiation with light 518 C. Irradiation with ions 519 X. Bulk Applications 519 A. Powder-in-tube method 520 B. Coated conductors 520 XI. Applications of Grain Boundaries in Thin Films 522 A. SQUIDs 522 B. Radiation detectors and spectrometers 524 C. Three-terminal devices 525 D. Superconducting logic circuits 526 E. Research devices 526 XII. Summary and Outlook 528 Acknowledgments 529 References 529

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“…Independently from the adopted model, the main signature of GB in the in-field microwave surface impedance consists in an abrupt, quasi-step-like increase of the surface resistance R s with increasing field, followed by a flat plateau [14,18]. The field scale over which the step actually extends varies from a few mT [14,18] for weak-links and Josephson vortices up to 0.1 T or larger for AJ vortices [13,19].…”

Section: Experimental Technique and Data Analysismentioning

confidence: 99%

Microwave properties of DyBCO monodomain in the mixed state and comparison with other RE-BCO systems

Pompeo

Rogai

Ausloos

et al. 2011

Physica C: Superconductivity and its Applications

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Surface impedance of YBa2Cu3O7−x thin film grain boundary Josephson junctions: Evaluation of the I cR n product

Cited by 14 publications

References 14 publications

Investigation of microwave losses in superconducting liquid phase epitaxy Y_0.7Yb_0.3Ba₂Cu₃O₇films

Investigation of microwave losses in superconducting liquid phase epitaxy Y_0.7Yb_0.3Ba₂Cu₃O₇films

Grain boundaries in high-Tcsuperconductors

Microwave properties of DyBCO monodomain in the mixed state and comparison with other RE-BCO systems

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Surface impedance of YBa2Cu3O7−x thin film grain boundary Josephson junctions: Evaluation of the I cR n product

Cited by 14 publications

References 14 publications

Investigation of microwave losses in superconducting liquid phase epitaxy Y0.7Yb0.3Ba2Cu3O7 films

Investigation of microwave losses in superconducting liquid phase epitaxy Y0.7Yb0.3Ba2Cu3O7 films

Grain boundaries in high-Tcsuperconductors

Microwave properties of DyBCO monodomain in the mixed state and comparison with other RE-BCO systems

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Product

Resources

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Investigation of microwave losses in superconducting liquid phase epitaxy Y_0.7Yb_0.3Ba₂Cu₃O₇films

Investigation of microwave losses in superconducting liquid phase epitaxy Y_0.7Yb_0.3Ba₂Cu₃O₇films