Superconducting characteristics of an SNS junction coupled with an LnBaCuO film

Tarutani, Y.; Fukazawa, T.; Kabasawa, Uki; Tsukamoto,; Hiratani, Masahiko; Suga, M.; Takagi, Kazumasa

doi:10.1016/0921-4534(91)91085-i

Cited by 4 publications

(1 citation statement)

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“…Josephson current has been measured in a planar-type junction of HoBa 2 Cu 3 O 7−y -La 1.5 Ba 1.5 CuO 3 O 7−x -HoBa 2 Cu 3 O 7−y for electrode spacing of the order of 0.1 µm and temperatures up to 70 K (J C = 1.8 × 10 7 A cm −2 at T = 4.2 K, R N A = 10 −8 A cm −2 ). The decay length has been estimated to be of the order of 65 nm [299]. Similar results have been obtained in doped-type coplanar Bi 2 Sr 2 CaCu 2 O 8+y -Bi 2 Sr 2 (Ca 1−z Gd z )Cu 2 O 8+y -Bi 2 Sr 2 CaCu 2 O 8+y junctions up to a width of 0.8 µm [300].…”

Section: Electron Doped Hts Junctions Based On Electron Doped Compoun...supporting

confidence: 80%

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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Section: Electron Doped Hts Junctions Based On Electron Doped Compoun...supporting

confidence: 80%