Deposition of YBCO Thin Films in View of Microwave Applications

Huhtinen, H.; Ulriksson, Jari; Malmivirta, Mika; Järvinen, J.; Jha, Rajveer; Awana, V. P. S.; Vasiliev, S.; Paturi, P.

doi:10.1109/tasc.2017.2669484

Cited by 7 publications

(5 citation statements)

References 25 publications

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“…Highly c-axis oriented YBCO films on single crystals exhibited J c > 10 6 A/cm 2 (77 K, self-field) which was again two orders of magnitude larger than the MTG YBCO samples. In a recent work, highly oriented YBCO thin films on different single crystal substrates were deposited and the role of the substrate material and thermal contact during the deposition are carefully investigated [37]. Thus, with the combined progress in the material and its processing, the current carrying capability of REBCO superconductors improved significantly.…”

Section: The Evolution Of Critical Current Density Of Ybco and Rebco mentioning

confidence: 99%

Superconductive REBCO Thin Films and Their Nanocomposites: The Role of Rare-Earth Oxides in Promoting Sustainable Energy

Jha

Matsumoto

2019

Front. Phys.

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The lossless transmission of direct electrical currents in superconductors is very often regarded as an "energy superhighway" with greatly enhanced efficiency. With the discovery of high temperature superconductors (HTS) in the late eighties, the prospect of using these materials in efficient and advanced technological applications became very prominent. The elevated operating temperatures as compared to low temperature superconductors (LTS), relaxing cooling requirements, and the gradual development of facile synthesis processes raised hopes for a broad breakthrough of superconductor technology. The impact of superconductor technology on the economy and energy sectors is predicted to be huge if these are utilized on a large scale. The development of superconducting tapes with high critical current density (J c) is crucial for their use in transmission cables. Many countries these days are running projects to develop wires from these HTS materials and simultaneously field trials are being conducted to assess the feasibility of this technology. These HTS wires can carry electrical currents more than 100 times larger than their conventional counterparts with minimal loss of energy. The increased efficiency of HTS electric power products may result in greatly reduced carbon emissions compared to those resulting from using the conventional alternatives. In order to use the thin films of YBa 2 Cu 3 O 7−δ (YBCO) and REBCO [RE (rare-earth) = Sm, Gd, Eu etc.], members of the HTS family, for future technological applications, the enhancement of J c over wide range of temperatures and applied magnetic fields is highly desired. The enhancement of J c of YBCO and REBCO films has been successfully demonstrated by employing different techniques which include doping by rare-earth atoms, incorporating nanoscale secondary phase inclusions into the REBCO film matrix, decoration of the substrate surface etc. which generate artificial pinning centers (APCs). In this review, the development of the materials engineering aspect that has been conducted over the last two decades to improve the current carrying capability of HTS thin films is presented. The effect of controlled incorporation of APCs through various methods and techniques on the superconducting properties of YBCO and REBCO thin films is presented, heading toward superior performance of such superconducting thin films.

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Section: The Evolution Of Critical Current Density Of Ybco and Rebco mentioning

confidence: 99%

Superconductive REBCO Thin Films and Their Nanocomposites: The Role of Rare-Earth Oxides in Promoting Sustainable Energy

Jha

Matsumoto

2019

Front. Phys.

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“…At the sum of the LO and RF frequencies, 3.9 GHz, P = −86.71 dBm and at the second harmony of the LO signal, 3.8 GHz, P = −57.02 dBm, i.e., the high frequency filtering is very effective. The high performance of the mixer at liquid nitrogen temperature makes this config uration attractive for cryogenic use, such as for circuits implemented in superconductor [36][37][38][39][40].…”

Section: Experimental Results At 77 Kmentioning

confidence: 99%

“…There is a limited number of reported mixers for the S-band at cryogenic tempera tures. In the following table we compare the performance of different mixers for cryogenic The high performance of the mixer at liquid nitrogen temperature makes this configuration attractive for cryogenic use, such as for circuits implemented in superconductors [36][37][38][39][40].…”

Section: Discussionmentioning

confidence: 99%

High-Performance RF Balanced Microstrip Mixer Configuration for Cryogenic and Room Temperatures

et al. 2021

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A high-performance S-band down-conversion microstrip mixer, for operation from 77 K to 300 K, is described. The balanced mixer combines a 90 degree hybrid coupler, two Schottky diodes, a band pass filter, and a low pass filter. The coupler phase shift drastically improves noise rejection. The circuit was implemented according to the configuration obtained from extensive simulation results based on electromagnetic analysis. The experimental results agreed well with the simulation results, showing a maximum measured insertion loss of 0.4 dB at 2 GHz. The microstrip mixer can be easily adjusted to different frequency ranges, up to about 50 GHz, through the proper choice of microstrip configuration. This novel S-band cryogenic mixer, implemented without resorting to special components, shows a very high performance at liquid nitrogen temperatures, making this mixer very suitable for high-temperature superconductive applications, such as front-ends.

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“…Further details of the PLD system together with deposition parameters have been given elsewhere [18]. The target for the films were prepared in-house as described in [12,[19][20][21][22][23][24][25] with either the solid state method or the sol-gel method. All in all, 65 different samples were used.…”

Section: Samples and Methodsmentioning

confidence: 99%

Roles of electron mean free path and flux pinning in optimizing the critical current in YBCO superconductors

Paturi

Huhtinen

2022

Supercond. Sci. Technol.

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We present a way to reach the maximum possible critical current density, Jc , for YBa2Cu3O6+x (YBCO) thin films. This value is found to be around ten times the currently reached values. It is found that the Jc}(0 T) is governed by the mean free path of the electrons, as is the critical temperature, Tc . The Jc in field, on the other hand, is governed by flux pinning and can be enhanced by optimizing the size and distribution of the non-superconducting nanoinclusions. By optimizing both the mean free path and the pinning structure, the maximum values can be reached

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Deposition of YBCO Thin Films in View of Microwave Applications

Cited by 7 publications

References 25 publications

Superconductive REBCO Thin Films and Their Nanocomposites: The Role of Rare-Earth Oxides in Promoting Sustainable Energy

Superconductive REBCO Thin Films and Their Nanocomposites: The Role of Rare-Earth Oxides in Promoting Sustainable Energy

High-Performance RF Balanced Microstrip Mixer Configuration for Cryogenic and Room Temperatures

Roles of electron mean free path and flux pinning in optimizing the critical current in YBCO superconductors

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