Boris Chesca
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View article: Parametric amplification of electromagnetic waves produced by a flux-flow-oscillator made of YBa2Cu3O7−δ Josephson junction arrays
Parametric amplification of electromagnetic waves produced by a flux-flow-oscillator made of YBa2Cu3O7−δ Josephson junction arrays Open
We observe parametric amplification of electromagnetic (EM) waves produced by a flux-flow oscillator made of YBa2Cu3O7−δ Josephson junctions arrays coupled to the resonant modes of a millimeter wave Fabry–Pérot resonator at a pump frequenc…
View article: The influence of magnetic vortices motion on the inverse ac Josephson effect in asymmetric arrays
The influence of magnetic vortices motion on the inverse ac Josephson effect in asymmetric arrays Open
We report on the influence a preferential magnetic vortices motion has on the magnitude of the inverse ac Josephson effect (the appearance of dc current Shapiro steps) and the coherent operation of asymmetrical parallel arrays of YBa2Cu3O7…
View article: The influence of magnetic vortices motion on the inverse ac Josephson effect in asymmetric arrays
The influence of magnetic vortices motion on the inverse ac Josephson effect in asymmetric arrays Open
We report on the influence a preferential magnetic vortices motion has on the magnitude of the inverse ac Josephson effect (the appearance of dc current Shapiro steps) and the coherent operation of asymmetrical parallel arrays of YBaCuO Jo…
View article: Parametric amplification of electromagnetic waves produced by a flux-flow-oscillator made of YBaCuO Josephson junction arrays
Parametric amplification of electromagnetic waves produced by a flux-flow-oscillator made of YBaCuO Josephson junction arrays Open
We observe parametric amplification of electromagnetic (EM) waves produced by a flux-flow oscillator made of YBa2Cu3O7 Josephson junctions arrays coupled to the resonant modes of a millimeter wave Fabry-Perot resonator at a pump frequency …
View article: SQUID-arrays coupled to on-chip integrated thin-film superconducting input coils operating coherently
SQUID-arrays coupled to on-chip integrated thin-film superconducting input coils operating coherently Open
Recently, Superconducting Quantum Interference Device (SQUID) arrays operating in a coherent voltage-modulation state at 77 K showed a flux-noise 10 times lower than that of single-SQUIDs at similar temperatures. To exploit the flux-noise …
View article: Magnetic flux quantum periodicity of the frequency of the on-chip detectable electromagnetic radiation from superconducting flux-flow-oscillators
Magnetic flux quantum periodicity of the frequency of the on-chip detectable electromagnetic radiation from superconducting flux-flow-oscillators Open
Superconducting flux-flow-oscillators (FFOs) based on unidirectional flow of magnetic vortices in a single-long Josephson junction (JJ) and operating at 4.2 K are key elements of sub-terahertz integrated-receivers used in radio-astronomy a…
View article: dc magnetometry of niobium thin film superconductors deposited using high power impulse magnetron sputtering
dc magnetometry of niobium thin film superconductors deposited using high power impulse magnetron sputtering Open
This is an Open Access Article. It is published by the American Physical Society under the Creative Commons Attribution 4.0 International Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/b…
View article: Superconducting devices based on coherent operation of Josephson junction arrays above 77K
Superconducting devices based on coherent operation of Josephson junction arrays above 77K Open
This paper was also presented at the 30th International Symposium on Superconductivity (ISS2017), Tokyo, Japan, 13-15 December 2017. Published under licence in Journal of Physics: Conference Series by IOP Publishing Ltd. Content from this …
View article: DC Magnetism of Niobium Thin Films
DC Magnetism of Niobium Thin Films Open
Niobium thin films were deposited onto a-plane sapphire with varying kinetic energy and varying substrate temperature. There were no consistent trends which related the particle energy or substrate temperature to RRR. The sample which disp…
View article: Magnetic field tunable vortex diode made of YBa2Cu3O7−δ Josephson junction asymmetrical arrays
Magnetic field tunable vortex diode made of YBa2Cu3O7−δ Josephson junction asymmetrical arrays Open
Several Josephson ratchets designed as asymmetrically structured parallel-series arrays of Josephson junctions made of YBa2Cu3O7−δ have been fabricated. From the current-voltage characteristics measured for various values of applied magnet…
View article: Physical Vapour Deposition of NbTiN Thin Films for Superconducting RF Cavities
Physical Vapour Deposition of NbTiN Thin Films for Superconducting RF Cavities Open
The production of superconducting coatings for radio frequency cavities is a rapidly developing field that should ultimately lead to acceleration gradients greater than those obtained by bulk Nb RF cavities. The use of thin films made from…
View article: DC magnetism of Niobium thin films
DC magnetism of Niobium thin films Open
Niobium thin films were deposited onto a-plane sapphire with varying kinetic energy and varying substrate temperature. There were no consistent trends which related the particle energy or substrate temperature to RRR. The sample which disp…
View article: 2D SQIF arrays using 20 000 YBCO high R<sub>n</sub>Josephson junctions, a viewpoint
2D SQIF arrays using 20 000 YBCO high R<sub>n</sub>Josephson junctions, a viewpoint Open
This article was published in the journal, Superconductor Science and Technology [© IOP Publishing Ltd]. The definitive version is available at: http://dx.doi.org/10.1088/0953-2048/29/8/080501