High Q-value resonators for the SHF-region based on TBCCO-films

Manzel, M.; Huber, Stefan; Bruchlos, H.; Bornmann, S.; Görnert, P.; Klinger, M.; Stiller, M.

doi:10.1109/22.508244

Cited by 7 publications

(5 citation statements)

References 9 publications

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“…Phases that intergrow with different numbers of Tl-O or Cu-O layers may manifest themselves as distinct crystalline regions within the film or as planar defects [5] and were thought to be responsible for growth steps on the film surface which have heights other than a multiple of the c-axis of the unit cell. A similar surface structure was observed on Tl(2223) films grown on LaAlO 3 by Manzel et al [93] using atomic force microscopy. These observations of surface structure are consistent with the (rather few) cross-sectional TEM studies of Tl HTS films (see, for example, [75,116]) which show that it is rare to find a significant volume of any film without some lattice defects, normally stacking faults in the c-direction.…”

Section: Microstructural Development In Tl-based Hts Thin Filmssupporting

confidence: 80%

“…One general point is that oxide films have a tendency for textured growth due to their strong directional bonding. Like all cuprate superconductors, the slow growth direction in TBCCO compounds is along the c-axis, while the aand b-axes are the fast growth directions [91][92][93][94]. Thus, for kinetic reasons these materials will intrinsically adopt a plate-like morphology, and the use of a substrate with a reasonable lattice match to the a-b plane of the TBCCO unit cell encourages the film to nucleate and grow with its c-axis perpendicular to the interface plane.…”

Section: Microstructural Development In Tl-based Hts Thin Filmsmentioning

confidence: 99%

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Thallium-based HTS thin films, processing, properties and applications

Bramley¹,

O'connor²,

Grovenor³

1999

Supercond. Sci. Technol.

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Thin films of the Tl-based high-temperature superconducting (HTS) phases are beginning to find application in a number of practical devices, especially in the field of microwave communication systems. This review describes the issues surrounding the fabrication of thin films of the thallium-based HTS materials. The influence of thermodynamics and kinetics, the various potential thalliation techniques and the selection of an appropriate substrate material are all important considerations when designing a process for the fabrication of thin films of these highly reactive materials. The properties of the resulting films are critically dependent on the microstructures developed during thalliation. Microstructural evolution during thalliation, the effect of structural defects on the properties of such films and the importance of achieving biaxial grain alignment in optimizing the properties of the films are all discussed.

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Section: Microstructural Development In Tl-based Hts Thin Filmssupporting

confidence: 80%

Section: Microstructural Development In Tl-based Hts Thin Filmsmentioning

confidence: 99%

Thallium-based HTS thin films, processing, properties and applications

Bramley¹,

O'connor²,

Grovenor³

1999

Supercond. Sci. Technol.

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“…While YBa 2 Cu 3 O 7−x (YBCO) or related 1:2:3 compounds remain the most widely used HTSs, the fabrication of highly textured Tl 2 Ba 2 Ca n Cu n+1 O y films (Tl2212, Tl2223) with low surface impedance has proceeded [7,8]. Despite their granular microstructure, these Tl compounds bear the advantage of higher critical temperatures compared with YBCO, thus lowering the expense of closed-cycle refrigeration.…”

Section: Hts Films and Substratesmentioning

confidence: 99%

Progress, properties and prospects of passive high-temperature superconductive microwave devices in Europe

Hein

1997

Supercond. Sci. Technol.

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The technology of high-temperature superconductors has become mature. Various methods to analyse and optimize the temperature and microwave field dependent surface impedance have been developed. Promising applications of passive microwave devices have been identified between 0.01 and 10 GHz. This progress profits from improved design and simulation tools, aimed at miniaturizing the circuits at optimum performance and integrating them into realistic systems. Important facets of these developments are sketched in terms of their physical basis and illustrated with selected examples of filters, stable oscillators and MRI antennas.

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“…Thus, the surface resistance of the superconductor must be considered when designing an antenna [7]. The techniques for measuring the surface resistance of a superconducting thin film are the microstrip line resonator (MSR) [9,10], the dielectric resonator [11][12][13], and the coplanar waveguide resonator [14,15]. When designing a microstrip device, using the value of the surface resistance measured by the MSR capable of measuring in the same form is appropriate [16].…”

Section: Introductionmentioning

confidence: 99%

Surface resistance measurement of superconducting thin film using probe‐coupling‐type microstrip line resonator

Okai

Kusünoki

Mukaida

et al. 2003

Electron Comm Jpn Pt II

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SUMMARYTo design superconducting microwave receivers, the surface resistance of the superconducting thin film must be considered. Therefore, a highly accurate technique for measuring the surface resistance of superconducting thin films should be established. In this paper, we propose a probe-coupled microstrip line resonator as a technique for measuring the surface resistance of superconducting thin films. In the resonator technique, the surface resistance is calculated from Q u , the unloaded Q, of the resonator. Since the microstrip line resonator searches for an accurate surface resistance of the superconducting thin film, establishing a technique that accurately determines the Q u of the resonator is crucial. We measure the Q u values of resonators fabricated from metal and superconducting thin film by a probe-coupled microstrip line resonator and describe the accuracy of Q u measurement by the probe-coupled micro-strip line resonator and the repeatability of the surface resistance measurement of a superconducting thin film.

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High Q-value resonators for the SHF-region based on TBCCO-films

Cited by 7 publications

References 9 publications

Thallium-based HTS thin films, processing, properties and applications

Thallium-based HTS thin films, processing, properties and applications

Progress, properties and prospects of passive high-temperature superconductive microwave devices in Europe

Surface resistance measurement of superconducting thin film using probe‐coupling‐type microstrip line resonator

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