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THIN FILM HIGH TC SUPERCONDUCTOR GROWTH AND CHARACTERISATION AT MICROWAVE FREQUENCIES

Objective

The overall objective is to develop the deposition and processing of thin film high temperature superconductors on novel substrates with large relative permittivities.
Some notable developments are listed below:

- Superconducting powders and targets have been produced for rare earth superconductors of the form ReBCO where Re = Y, Gd, Dy, Eu, Tm, Lu, Ho.

- A variety of high quality HTS epitaxial films have been deposited, including Y-123, BISCCO, Tm-123 and Lu-123. Two inch YBCO films of world-class performance (Jc = 10 MA cm{-2} at 77 K) have been produced.

- Methods of depositing films: Pulsed laser deposition, MBE and sputter deposition have been extensively trialed.

- Packaged and connectorised microwave filters, delay lines and resonators have been demonstrated. Some of these have been incorporated into stand-alone mechanically cooled cryosystems.
Two superconducting materials Y1Ba2Cu3O7-x and Bi2Sr2CaN-1Oy will be deposited by laser photoablation, molecular beam epitaxy and radio frequency sputtering and spin spray techniques. Four deposition techniques are being employed to establish which will yield the best large area, single phase, high critical current superconductors. Chemical engineering of the superconductors will also be carried out to optimise their electrical properties, processability and stability.

Electrical, physical and chemical properties of the superconducting films will be carried out using all the major assessment techniques. However, the ultimate test is to fabricate microstrip microwave components and assess their performance. Device fabrication will necessitate accurate patterning of the superconducting films. This will be achieved by eximar laser ablation or etching using wet or reactive ion etchants.

The significance of this work is reflected in the large $670M worldwide (1990) market for filters and delay lines alone. The projected market in Europe ($150M) is comparable to the markets in the USA ($281M) and Japan ($239).

Coordinator

ERA TECHNOLOGY LTD
Address
Cleeve Road
KT22 7SA Leatherhead, Surrey
United Kingdom

Participants (6)

Ceramics and Refractories Technological Development Company
Greece
Address
Aidipsos National Road 5Th Km
34100 Chalkida
Cryogenic Consultants Ltd
United Kingdom
Address
5 Orwell Furlong
CB4 4WY Cambridge
Danmarks Tekniske Hojskole
Denmark
Address

2800 Lyngby
Johannes Kepler Universitat Linz
Austria
Address
Altenbergerstrasse 69
4040 Linz
NKT Research Center a/s
Denmark
Address
Sognevej 11
2605 Broendby
National Centre for Scientific Research "Demokritos"
Greece
Address
Aghia Paraskevia Attikis
15310 Athinai