Coherent vortex motion in superconducting nanobridges based on YBaCuO thin films

Pedyash, M.V.; Gerritsma, G.J.; Blank, D.M.A.; Rogalla, Horst

doi:10.1109/77.402823

Cited by 20 publications

(10 citation statements)

References 9 publications

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“…Our values are lower than the depairing current, suggesting rather flux-flow regime [5], [16]. Differently from other measurements [13], [14], [16], we did not observe any increase of for the few microbridges measured below 150 nm. In all cases reduction of was observed, but a more systematic study is required.…”

Section: Device Characterization and Discussioncontrasting

confidence: 84%

“…On one hand HTS nano-devices might be the key for junctions with superior performances and reproducibility [5]- [10], and are expected to lead to an increase of the critical current density up to the depairing value [11] or, in suitable conditions, to vortex coherent motion [12], [13]. On the other transport studies of nanoscale devices are considered very important Manuscript to possibly unveil several issues on HTS and its pairing mechanism, to discern various states in the HTS phase diagram by virtue of the system size [14], [15].…”

Section: Introductionmentioning

confidence: 99%

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YBCO Nanobridges: Simplified Fabrication Process by Using a Ti Hard Mask

Papari¹,

Carillo

Born

et al. 2009

IEEE Trans. Appl. Supercond.

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An innovative fabrication procedure has been developed to obtain YBa 2 Cu 3 O 7 x (YBCO) nanobridges from c-axis oriented films. The novelty regards the use of a thin titanium mask used in the patterning process. The use of the Ti makes simpler the fabrication procedure guaranteeing high quality devices, as demonstrated by transport measurements. Critical temperatures and critical current densities scale with the width of the microbridge down to 200 nm in agreement with most results available in literature. The actual properties of the devices, performances, yield and reproducibility, along with an accurate control on doping, may allow the use of these micro-bridges for nanoscale experiments.

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Section: Device Characterization and Discussioncontrasting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

YBCO Nanobridges: Simplified Fabrication Process by Using a Ti Hard Mask

Papari¹,

Carillo

Born

et al. 2009

IEEE Trans. Appl. Supercond.

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“…[4][5][6][7][8][9] A critical temperature T c Ͼ85 K and superconducting transition width ␦T c ϭ1-2 K are typical for films with dу10 nm, and a critical current density j c ϭ8ϫ10 6 A/cm 2 was observed in 10-nm-thick films at 77 K. 8 Fabrication of superconducting structures made from YBCO with in-plane sizes 100-500 nm has also been demonstrated. [10][11][12][13] Critical current densities as large as 5ϫ10 6 A/cm 2 have been measured in 200-nm-wide superconducting lines. 14 A variety of materials ͑e.g., MgO, LaAlO 3 , NdGaO 3 , YSZ͒ have been found to provide a mod-erate dielectric constant and epitaxial YBCO film growth.…”

Section: Introductionmentioning

confidence: 99%

Analysis of a high-Tc hot-electron superconducting mixer for terahertz applications

Karasik

McGrath

Gaidis

1997

Journal of Applied Physics

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The prospects of a YBa 2 Cu 3 O 7Ϫ␦ hot-electron bolometer mixer for a THz heterodyne receiver are discussed. The modeled device is a submicron bridge made from a 10-nm-thick film on a high thermal conductance substrate. The mixer performance expected for this device is analyzed in the framework of a two-temperature model which includes heating both of the electrons and the lattice. Also, the contribution of phonon diffusion from the film through the substrate and from the film to the normal metal contacts is evaluated. The intrinsic conversion efficiency and the noise temperature have been calculated as functions of the device size, local oscillator ͑LO͒ power, and ambient temperature. Assuming thermal fluctuations and Johnson noise to be the main sources of noise, a minimum single sideband mixer noise temperature of Х2000 K is predicted. For our modeled device the intrinsic conversion loss at an intermediate frequency of 2.5 GHz is less than 10 dB and the required LO power is ϳ1-10 W.

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“…5. The simplest case, the voltage is proportional to the square of the bias current [11]. The other is the thermal-activation, in which the voltage increases exponentially.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Narrowed ${\rm YBa}_{2}{\rm Cu}_{3}{\rm O}_{7-{\rm x}}$ Nanobridges Down to 30 nm With Reduced Degradation

Kajino

Kimura

Horii

et al. 2009

IEEE Trans. Appl. Supercond.

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We have established the new method of fabricating high-c YBa 2 Cu 3 O 7 x (YBCO) nanobridges with high reproducibility. Nanobridges ranging in 30-400 nm wide were formed by using electron beam lithography. An ultra thin film of 2-3 nm-thick insulative YBCO was deposited after nanobridge formation for recovering the damaged films occurred in the process.The critical current density c was approximately 620 MA cm 2 at 4.2 K in a width of 30 nm bridges, and increased by about two orders of magnitude in the different widths of c . The critical temperature c was 87 K, about the same as c of the film. The current-voltage characteristics showed a different curve from the conventional flux-flow type as the widths have been narrowed. Nanobridges developed in this study are expected to the applications for nano-SQUIDs or the optical input/output interfaces in single-flux-quantum circuits.

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Coherent vortex motion in superconducting nanobridges based on YBaCuO thin films

Cited by 20 publications

References 9 publications

YBCO Nanobridges: Simplified Fabrication Process by Using a Ti Hard Mask

YBCO Nanobridges: Simplified Fabrication Process by Using a Ti Hard Mask

Analysis of a high-Tc hot-electron superconducting mixer for terahertz applications

Preparation of Narrowed ${\rm YBa}_{2}{\rm Cu}_{3}{\rm O}_{7-{\rm x}}$ Nanobridges Down to 30 nm With Reduced Degradation

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