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| 2. |
- Huang, MQ, et al.
(författare)
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Small Scale Integrated Technology for HTS RSFQ Circuits
- 2001
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Ingår i: IEEE Transactions on Applied Superconductivity. - : Institute of Electrical and Electronics Engineers (IEEE). - 1051-8223. ; 11:1, s. 558-
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Tidskriftsartikel (refereegranskat)
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| 3. |
- Högberg, Björn, et al.
(författare)
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Novel in-situ fabricated Josephson Junctions: tyrilayer on a substrate slope
- 2003
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Ingår i: IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY ASC. - 1051-8223. ; 13:2, part 1, s. 794-796
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Tidskriftsartikel (refereegranskat)abstract
- We demonstrate a high-temperature superconductor (HTS) Josephson junction geometry using only in situ interfaces and with the current flowing in the – plane of the HTS. The trilayer on a substrate slope (TOSS) junction is a HTS-barrier-HTS structure deposited in situ on top of a pre-etched slope in the substrate. We present initial results on the fabrication and testing of YBa2Cu3O7 TOSS junctions with a Ga-doped PrBa2Cu3O7 barrier. These devices display resistively shunted junction like – characteristics with characteristic voltages up to 5 mV at 4.2 K. The TOSS junction concept is of interest for fundamental studies of interfaces in HTS and can also be applied to an integrated circuit technology.
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| 4. |
- Nilsson, P A, et al.
(författare)
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Planarized patterning of Y-Ba-Cu-O thin films for multilayer technology
- 1995
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Ingår i: IEEE transactions on applied superconductivity (Print). - : Institute of Electrical and Electronics Engineers (IEEE). - 1051-8223 .- 1558-2515. ; 5, s. 1653-1656
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Tidskriftsartikel (refereegranskat)abstract
- Planarized layers of YBa2Cu3O7 (YBCO) were made by etching trenches in SrTiO3 (STO) substrates, laser depositing a YBCO film and mechanically polishing the film down to the substrate surface. These structures exhibited critical temperatures (Tc) of 88 K and a critical-current density (Jc) of 106 A/cm2 at 77 K. The planarized surface was smooth, with a maximum height difference between the YBCO and STO of 20 nm. The surfaces were used as templates for epitaxial growth of multilayer insulators of STO and PrBa2Cu3O7 (PBCO) and top YBCO layers. Complete crossovers, free of superconducting shorts, with Tc of 86 K and critical current density (Jc) of 2×105 A/cm2 were made.
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| 5. |
- Politano, D., et al.
(författare)
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Technical and Economical Assessment of HTS Cables
- 2001
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Ingår i: IEEE Transactions on Applied Superconductivity. - : Institute of Electrical and Electronics Engineers (IEEE). - 1051-8223. ; 11:1, s. 2477-2480
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Tidskriftsartikel (refereegranskat)
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| 6. |
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| 7. |
- Sjöström, Mårten, et al.
(författare)
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Equivalent Circuit Model for Superconductors
- 2003
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Ingår i: IEEE transactions on applied superconductivity (Print). - 1051-8223 .- 1558-2515. ; 13:2, s. 1890-1893
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Tidskriftsartikel (refereegranskat)abstract
- We propose an equivalent circuit model that describes the behaviour of a superconductor viewed by an external user, for whom the global variables voltage and current are of interest. It is used in time-continuous simulations and it treats well both the subcritical and supercritical current regime. The model is based on Maxwell's equations, measurement results as well as on the physical structure of a superconducting tape. The incorporated circuit elements have been described in mathematical expressions: a nonlinear resistance and a nonlinear inductance (superconducting core) in parallel with a linear resistance and a linear inductance (silver sheath or by-pass material). The simplicity of the model makes it fast and easy to apply compared to existing numerical models of superconductors, based on finite element methods. Furthermore, it is wide-ranging and may represent a superconductor in many different applications depending on parameter values. Examples of applied voltage and current with non-stationary waveforms on a HTS tape are given. Calculated are the hysteresis losses (due to flux pinning) and resistive losses (due to flux creep and flux flow) in the tape in the range 0.1 to 1.8 Ic.
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