Fabrication of biepitaxial YBCO Josephson junctions on different substrates

Petersen, K.; Stölzel, C.; Schmitt, Martin; Krimmer, C.; Wilkens, W.; Söllner, J.; Grueninger, H.W.; Adrian, H.

doi:10.1109/77.403016

Cited by 2 publications

(2 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1 See, for example, Ijsselsteijn et al, 1993Ijsselsteijn et al, , 1994Vollnhals et al, 1994;Li et al, 1995;Petersen, Stolzel, et al, 1995;Boikov et al, 1997aBoikov et al, , 1997bY. Chen et al, 1997;Horng et al, 1997;Villegier, 1997a, 1997b;Tsaiet al, 1998.…”

Section: Structural Propertiesmentioning

confidence: 99%

Grain boundaries in high-Tcsuperconductors

2002

View full text Add to dashboard Cite

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

show abstract

Section: Structural Propertiesmentioning

confidence: 99%

Grain boundaries in high-Tcsuperconductors

2002

View full text Add to dashboard Cite

show abstract

“…Epitaxy of (001) YBCO on (100) CeO 2 takes place through a 45 • rotation of the in-plane axes. Most results refer to YBCO [176][177][178][179][180][181][182], and the use of additional buffer layers in a multi-layer configuration has been proved to enhance critical current densities J C up to 10 4 A cm −2 at 77 K [177]. This technique has also been applied to fabricate BiSCCO junctions [183].…”

Section: Biepitaxial Junctionsmentioning

confidence: 99%

Weak links in high critical temperature superconductors

Tafuri¹,

2005

View full text Add to dashboard Cite

The traditional distinction between tunnel and highly transmissive barriers does not currently hold for high critical temperature superconducting Josephson junctions, both because of complicated materials issues and the intrinsic properties of high temperature superconductors (HTS). An intermediate regime, typical of both artificial superconductorbarrier-superconductor structures and of grain boundaries, spans several orders of magnitude in the critical current density and specific resistivity. The physics taking place at HTS surfaces and interfaces is rich, primarily because of phenomena associated with d-wave order parameter (OP) symmetry. These phenomena include Andreev bound states, the presence of the second harmonic in the critical current versus phase relation, a doubly degenerate state, time reversal symmetry breaking and the possible presence of an imaginary component of the OP. All these effects are regulated by a series of transport mechanisms, whose rules of interplay and relative activation are unknown. Some transport mechanisms probably have common roots, which are not completely clear and possibly related to the intrinsic nature of high-T C superconductivity. The d-wave OP symmetry gives unique properties to HTS weak links, which do not have any analogy with systems based on other superconductors. Even if the HTS structures are not optimal, compared with low critical temperature superconductor Josephson junctions, the state of the art allows the realization of weak links with unexpectedly high quality quantum properties, which open interesting perspectives for the future. The observation of macroscopic quantum tunnelling and the qubit proposals represent significant achievements in this direction. In this review we attempt to encompass all the above aspects, attached to a solid experimental basis of junction concepts and basic properties, along with a flexible phenomenological background, which collects ideas on the Josephson effect in the presence of d-wave pairing for different types of barriers.

show abstract

Fabrication of biepitaxial YBCO Josephson junctions on different substrates

Cited by 2 publications

References 5 publications

Grain boundaries in high-Tcsuperconductors

Grain boundaries in high-Tcsuperconductors

Weak links in high critical temperature superconductors

Contact Info

Product

Resources

About