Thin-Film High-Temperature Superconductors for Advanced Communications and Electronics

Lauder, A.; Myers, K. E.; Face, D.W.

doi:10.1002/(sici)1521-4095(199810)10:15<1249::aid-adma1249>3.0.co;2-7

Cited by 29 publications

(16 citation statements)

References 8 publications

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“…Thin-film devices made from high-Tc superconductors (HTS) are encouraging candidates for the improvement of existing electronics [1][2][3][4][5]. Much attention has been paid to passive microwave devices, including delay lines, multiplexers, resonators and filters for mobile, cellular and satellite communications [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Microwave Current Imaging in Passive HTS Components by Low-Temperature Laser Scanning Microscopy (LTLSM)

2006

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distributed parameters in SC films as a function of the local critical current [27]. It is possible to manifest local resistive characterization of the SC transition [28][29][30], the spatial variations of magnetic and electromagnetic fields [31][32][33][34], and to carry out 2-D defectoscopy of structural and technological faults in operating SC devices and circuits [35][36][37]. In this work, we apply the LTLSM technique to analyze the redistribution of rf current flow in the vicinity of typical microdefects in YBCO films leading to anomalously high rf photoresponse, and possibly to nonlinear microwave behavior of SC devices. We have used the LTLSM technique for a spatially resolved investigation of the microwave transport properties, nonlinearities and material inhomogeneities in an operating coplanar waveguide YBa2Cu3O7-d (YBCO) microwave resonator on an LaAlO3 (LAO) substrate. The influence of twin-domain blocks, inplane rotated grains, and micro-cracks in the YBCO film on the nonuniform rf current distribution were measured with a micrometer-scale spatial resolution. The impact of the peaked edge currents and rf field penetration into weak links on the linear device performance were studied as well. The LTLSM capabilities and its future potential for non-destructive characterization of the microwave properties of superconducting circuits are discussed

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Section: Introductionmentioning

confidence: 99%

Microwave Current Imaging in Passive HTS Components by Low-Temperature Laser Scanning Microscopy (LTLSM)

2006

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“…[28][29][30] The electrical and microwave performance of these sputtered YBCO films is comparable to high-quality films deposited by other techniques such as thermal coevaporation 31 and PLD. 32 However, it is relatively difficult to obtain a uniform thickness distribution for large-area YBCO thin films using the sputtering method. Due to the variation of source-to-sink distance and the different angular distribution of atom emissions, the deposition rate on different places of a substrate cannot be a constant.…”

Section: Introductionmentioning

confidence: 99%

Sputter deposition of large-area double-sided YBCO superconducting films

Xiong

Tao

2011

High-Temperature Superconductors

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“…The technology is based on epitaxial growth of optimally doped copper oxide films YBa 2 Cu 3 O 6.95 (YBCO) on single crystal (100) lanthanum aluminate LaAlO 3 (LAO) substrates. [1] Thin (d < λ L ~200 nm at 4.2 K, where λ L is the London penetration depth) epitaxial YBCO films, with critical temperature of super-conducting transition, T c ≈ 92 K above the boiling point of liquid nitrogen (T LN2 ≈ 77.3 K), demonstrate very high critical current density, J c (T B ≈ 77 K) >(1-2) MA cm −2 (where T B is the sample temperature), and low microwave surface resistance, R S (T B~7 7 K, f = 10 GHz < 0.5 mΩ. [2] Thick (d >2 λ L ) YBCO coatings, in spite of their mainly polycrystalline microstructure, show similar characteristics.…”

Section: Introductionmentioning

confidence: 99%

Effect of LaAlO3 twin-domain topology on local dc and microwave properties of cuprate films

Zhuravel

Anlage

Remillard

et al. 2010

Journal of Applied Physics

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Different imaging modes of low temperature laser scanning microscopy (LTLSM) have been applied to probe local optical and superconducting properties, as well as the spatial variations in thermoelectric and electronic (both dc and rf) transport, in a YBa 2 Cu 3 O 6.95 /LaAlO 3 (YBCO/LAO) superconducting microstrip resonator with micron-range resolution. Additionally, the local sources of microwave nonlinearity (NL) were mapped in two-dimensions simultaneously by using the LTLSM in two-tone rf intermodulation distortion contrast mode as a function of (x, y) position of the laser beam perturbation on the sample. The influence of the direction of individual twin-domain YBCO blocks on its NL properties was analyzed in detail. The result shows the direct spatial correlation between NL microwave and dc electronic transport properties of the YBCO film that are imposed by the underlying twindomain topology of the LAO substrate. In these circumstances, the scale of local NL current densities J IM (x, y) in different areas of the YBCO microstrip quantitatively coincide with the scale of local critical current densities J c (x, y) measured at the same positions.

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Thin-Film High-Temperature Superconductors for Advanced Communications and Electronics

Cited by 29 publications

References 8 publications

Microwave Current Imaging in Passive HTS Components by Low-Temperature Laser Scanning Microscopy (LTLSM)

Microwave Current Imaging in Passive HTS Components by Low-Temperature Laser Scanning Microscopy (LTLSM)

Sputter deposition of large-area double-sided YBCO superconducting films

Effect of LaAlO3 twin-domain topology on local dc and microwave properties of cuprate films

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