Asymmetric Magnetic Interference Patterns in 0-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">π</mml:mi></mml:math>Josephson Junctions

Agterberg, D. F.; Sigrist, Manfred

doi:10.1103/physrevlett.80.2689

Cited by 6 publications

(2 citation statements)

References 25 publications

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“…There is a staggered phase for the d x 2 −y 2 -component. This would give rise to compensating contributions of the two domains to the Josephson effect, similar to the situation discussed in the context of c-axis junction between an s-wave and a twinned hightemperature superconductor 38,39 . In addition, this configuration could give rise to spontaneous half-quanta flux lines wherever a domain wall hits the junction perpendicularly.…”

Section: Other Chiral Superconducting Phasesmentioning

confidence: 95%

Josephson interferometer in a ring topology as a proof of the symmetry ofSr2RuO4

et al. 2005

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The Josephson effect is theoretically studied in two types of SQUIDs consisting of s wave superconductor and Sr2RuO4. Results show various response of the critical Josephson current to applied magnetic fields depending on the type of SQUID and on the pairing symmetries. In the case of a px + ipy wave symmetry, the critical current in a corner SQUID becomes an asymmetric function of magnetic fields near the critical temperatures. Our results well explain a recent experimental finding [Nelson et. al, Science 306, 1151]. We also discuss effects of chiral domains on the critical current.

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Section: Other Chiral Superconducting Phasesmentioning

confidence: 95%

Josephson interferometer in a ring topology as a proof of the symmetry ofSr2RuO4

et al. 2005

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“…Asymmetries arise whenever parity symmetry is broken in the junctions. In general the junction generates selffields which introduce an asymmetry in the critical current under reversal of the magnetic field [110,111,114,115,123].…”

Section: Dependence Of the Critical Current On The Magnetic Fieldmentioning

confidence: 99%

Weak links in high critical temperature superconductors

Tafuri¹,

2005

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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.

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