High-temperature superconducting edge-type Josephson junctions with modified interfaces

Satoh, T.; Hidaka, Mutsuo; Tahara, S.

doi:10.1109/77.783695

Cited by 119 publications

(42 citation statements)

References 13 publications

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“…In order to improve the junction characteristics, various trials have been carried out. Satoh et al [2] reported the products at 4.2 K of 2.5 mV for the junctions fabricated through the "in-situ" process and the -spreads in for 100-junction series-arrays as small as 8%. Soutome et al [8] reported a smaller -spread in of 6.6% for 100-junction series-arrays.…”

Section: Introductionmentioning

confidence: 98%

Ramp-edge junctions with interface-modified barriers fabricated on YBCO thick films

Wakana

Adachi

Sugiyama

et al. 2003

IEEE Trans. Appl. Supercond.

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We fabricated ramp-edge junctions with an interface-modified barrier on YBa 2 Cu 3 O (YBCO) liquid phase epitaxy (LPE) thick films. The LPE thick films were used as ground-planes. For the insulating layer between the ground plane and base electrode, a SrTiO 3 (STO)/(LaAlO 3 ) 0 3 -(SrAl 0 5 Ta 0 5 O 3 ) 0 7 (LSAT)/STO multilayer with the dielectric constant of approximately 32 was employed. We fabricated ramp-edge junctions with La-doped YBa 2 Cu 3 O (La-YBCO) and La-doped YbBa 2 Cu 3 O (La-YbBCO) as base and counter electrodes, respectively. The fabricated junctions exhibited resistively and capacitively shunted junction (RCSJ)-like characteristics and typical c n products of 2.6 and 1.1 mV at 4.2 and 40 K, respectively. The 1 -spread in c as small as 8.1% was obtained for 100-junction series-arrays. The use of ground plane reduced the sheet inductance of electrodes to a value of 0.76-0.94 pH/square at 4.2 K.

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Section: Introductionmentioning

confidence: 98%

Ramp-edge junctions with interface-modified barriers fabricated on YBCO thick films

Wakana

Adachi

Sugiyama

et al. 2003

IEEE Trans. Appl. Supercond.

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“…Since the initial proposal of the interface-modified ramp-edge junction by Moeckly and Char [15], it has been improved in many laboratories [16]- [18]. The spreads in of 8% was achieved for a 100-junction series-array on a ground plane at 4.2 K [18].…”

Section: Junction Characteristicsmentioning

confidence: 97%

Output Interface With Latching Driver for LTS-SFQ Circuits

Hato

Horibe

Wakana

et al. 2005

IEEE Trans. Appl. Supercond.

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We propose an output interface with a latching driver for single-flux-quantum (SFQ) circuits operating at 4.2 K. An optimum critical current density of the latching driver was discussed, and a multichip module (MCM) structure with SFQ circuits and latching drivers was proposed for 40-Gb/s operation. To optimize of the latching driver, we calculated the punchthrough probability of Nb-Al-AlO -Nb junctions and high-temperature superconductor (HTS) junctions. The Nb junction with a of 45 kA/cm 2 , which has a hysteresis of 44% for the latching operation, leads to a punchthrough probability lower than 10 15 for an ideal ac-bias of 40 GHz. On the other hand, ramp-edge-type interface-modified junctions based on YBa 2 Cu 3 O 7 have an optimum of 60 kA/cm 2 that gives the smallest punchthrough probability lower than 10 15 for an ideal ac-bias of 40 GHz without any shunt capacitance. Because the optimum of 45 kA/cm 2 for the latching driver is too large to fabricate large-scale integrated SFQ circuits with the Nb junction, the MCM structure consisting of SFQ circuits and latching drivers with the optimum is important to prepare 40-Gb/s SFQ systems. The of 60 kA/cm 2 is a practical value for the HTS junctions, and use of the low-temperature superconductor (LTS)-HTS MCM structure is also one way to realize the high-speed SFQ systems.Index Terms-Interface circuit, latching driver, multichip module (MCM), punchthrough, single-flux quantum (SFQ).

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“…A similar structure is widely used in hightemperature superconductors because of its two-dimensional crystal structure [9,10].…”

Section: Edge Structurementioning

confidence: 99%

A novel magnetic tunnel junction structure using the edge of a magnetic film

Sugiyama

Inokuchi

Saito

2007

Journal of Magnetism and Magnetic Materials

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High-temperature superconducting edge-type Josephson junctions with modified interfaces

Cited by 119 publications

References 13 publications

Ramp-edge junctions with interface-modified barriers fabricated on YBCO thick films

Ramp-edge junctions with interface-modified barriers fabricated on YBCO thick films

Output Interface With Latching Driver for LTS-SFQ Circuits

A novel magnetic tunnel junction structure using the edge of a magnetic film

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