A5001989011- Physics of Superconductivity and Magnetism
- Superconducting Materials and Applications
- Magnetic properties of thin films
- ZnO doping and properties
- HVDC Systems and Fault Protection
- Electronic and Structural Properties of Oxides
- Superconductivity in MgB2 and Alloys
- Magnetic and transport properties of perovskites and related materials
- Acoustic Wave Resonator Technologies
- Iron-based superconductors research
- Fluid Dynamics and Thin Films
- Magnetic Field Sensors Techniques
- Ferroelectric and Piezoelectric Materials
- Advanced Condensed Matter Physics
- Superconducting and THz Device Technology
- Energy Harvesting in Wireless Networks
- Wireless Power Transfer Systems
- Astro and Planetary Science
- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced Electrical Measurement Techniques
- Transition Metal Oxide Nanomaterials
- Silicon Carbide Semiconductor Technologies
- Magneto-Optical Properties and Applications
- Electrical Fault Detection and Protection
- Magnetic confinement fusion research
Theva (Germany)
2020-2022
Helmholtz Institute Jena
2006-2012
Friedrich Schiller University Jena
2006-2012
Abstract This paper presents a roadmap to the application of AI techniques and big data (BD) for different modelling, design, monitoring, manufacturing operation purposes superconducting applications. To help superconductivity researchers, engineers, manufacturers understand viability using BD as future solutions challenges in superconductivity, series short articles are presented outline some potential applications solutions. These futuristic routes their materials/technologies considered...
The displacive phase transition in SrTiO3 was investigated by means of x-ray diffraction. We used 4.5 keV photons thus probing only a very thin region near the surface. In low temperature lattice parameters evolve substantially different than bulk material. also under influence an epitaxial coating with YBaCu2O7 and found nature changed. near-surface behaves like film.
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation S. Schmidt, Döring, F. Schmidl, V. Grosse, P. Seidel, K. Iida, Kurth, Haindl, I. Mönch, B. Holzapfel; BaFe1.8Co0.2As2 thin film hybrid Josephson junctions. Appl. Phys. Lett. 25 October 2010; 97 (17): 172504. https://doi.org/10.1063/1.3505526 Download citation file: Ris (Zotero) Reference Manager EasyBib...
This paper outlines the initial development of a novel magnetohydrodynamic (MHD) plasma control system which aims at mitigating shock-induced heating and radio-frequency communication blackout typically encountered during (re-)entry into planetary atmospheres. An international consortium comprising universities, SMEs, research institutions, industry has been formed in order to develop this technology within MEESST project. The latter is funded by Future Emerging Technologies (FET) program...
Abstract The normal zone propagation velocity (NZPV) of three families REBCO tape architectures designed for superconducting fault current limiters and to be used in high voltage direct transmission systems has been measured experimentally liquid nitrogen at atmospheric pressure. NZPVs span more than orders magnitude depending on the architectures. Numerical simulations based finite elements allow us reproduce experiments well. dynamic transfer length (CTL) extracted from numerical was found...
We report on a novel fabrication scheme obtaining metal nanoparticles grown in crystal high index ambient, i.e. SrTiO3 (STO). Starting from deposited Au layer ellipsoidal and orientated nanoantennas can be prepared controlled via laser ablation. discuss the deposition conditions demonstrate geometrical properties of embedded by Transmission Electron Micrography (TEM) X-ray Diffraction (XRD) investigations. The plasmonic activity resulting highly crystalline particles could observed...
Increasing the HTS film thickness would be straightforward route to enhance current transport capacity of coated conductors. Usually, however, growth defects lead a strong deterioration critical density with thickness. The unique mode films on graded and tilted MgO buffer layers grown by inclined substrate deposition (ISD) paves way overcome this limit. This contribution presents micro-structural performance data conductors monolithic REBCO-films up 7.5 μm exhibiting perfect crystallinity...
Abstract High heat flux and radio blackout are well-known challenges space vehicles have been facing during re-entry into a planet’s atmosphere since the early days of space-flight. Thermal protection systems developed to protect spacecraft astronauts, however, they often heavy some be replaced after each mission. temperatures in compressed gas shock wave lead partial ionization. The dense plasma can cause blackout, i.e. attenuation or reflection waves thus blocking data-telemetry...
Abstract In order to improve transport and noise properties of YBa 2 Cu 3 O 7– δ thin films, we studied a technique produce gold nano‐particles in these films. We report on the formation particles from layers during pulsed laser deposition . Depending initial layer thickness analyzed their size distribution structural properties. Gold preferentially grow at surface SrTiO /YBa interface show an epitaxial alignment parallel 〈001〉 YBCO direction. discuss influence crystal structure regard...
We prepared direct-current superconducting quantum interference device (dc-SQUID) gradiometers consisting of a single YBa2Cu3O7- δ (YBCO) layer on SrTiO3 (STO) bicrystal substrates. The thin film was modified by embedding crystalline gold nanoparticles. investigated the growth conditions these particles as well their influence properties YBCO film. In our magneto-optical measurements we found that presence embedded nano crystals results in distinct enhancement jc over whole temperature...
Abstract High-voltage direct current transmission systems are expected to allow the of huge volumes electricity over long distances. The use superconducting fault limiters (SFCLs) based on second-generation (2G) high-temperature superconductor (HTS) coated conductors (CCs) is a promising solution mitigate currents in DC systems. To fabricate SFCL whose size remains acceptable, which means minimizing length HTS tape used, must sustain high electric field during whole duration. In this paper,...
The primary benefit of a metallic stabilization/shunt in high temperature superconductor (HTS) coated conductors (CCs) is to prevent joule heating damage by providing an alternative path for the current flow during HTS normal state transition (i.e., quench). However, shunt presence combination with unavoidable fluctuations critical (Ic) film can develop localized quench along CC's length if operational kept close Ic. This scenario, also known as hot-spot regime, lead rupture CC local does...
We present experimental studies on the dielectric properties of amorphous cerium dioxide in Au–CeO2–Au systems strontium titanate substrates. From measurements capacitance versus contact area we calculated constant at room temperature to be r = 26.9 ± 0.5. These also reveal an additional offset capacitance, which can attributed stray fields substrate material. I–V characteristics show that current transport through insulator changes from electrode-limited bulk-limited conduction.
MgO buffer layers were grown by Inclined Substrate Deposition (ISD) for superconducting coated conductors. The surface structure, texture, and extended defects analyzed films with different layer thicknesses. A roof-tile structure was only observed thicknesses exceeding 800 nm. facet widths amplitudes determined At nm the facets height 18 width 71 corresponding values measured a 5 μm thick film 64 234 nm, respectively. For smaller than 200 polycrystalline grain size of 20 larger ISD grew in...
Abstract We prepared and investigated grain boundary Josephson junctions based on SrTiO 3 bicrystal substrates. During the deposition of YBa 2 Cu O 7–δ (YBCO) gold nanocrystals forming from an intermediate layer can modify crystalline structure thus properties YBCO boundaries. The variation film thickness Au seed changes growth conditions nanocrystals. values characteristic I C R N product do not change whereas critical current decrease. magnified image (© 2011 WILEY‐VCH Verlag GmbH &...
In applications for high-Tc superconducting DC-SQUIDs such as biomagnetism, nondestructive evaluation and the relaxation of magnetic nanoparticles, it is important to maintain reliable sensor performance over an extended time period. We designed produced DC-SQUID gradiometers based on YBCO thin films which are inductively coupled a flux transformer achieve higher sensitivity. The protected against ambient atmosphere humidity by SiO2 amorphous layers. noise properties in flip-chip...
Here, we present a planar superconducting quantum interference device (SQUID) structure consisting of four SQUIDs connected to antenna structures for simultaneous measurements two magnetic field components. Using YBa2Cu3O7−x thin film technology, are able prepare gradiometer on strontium titanate (SrTiO3) tetracrystals containing crossing 30° grain boundaries. This allows the production SQUID loops onto one substrate which can fulfill high demands symmetry inside structures. In our...
We have shown that thermoelastic losses give the significant contribution to total mechanical damping in low loss quartz even for bulk samples if thickness of sample is smaller than other dimensions. developed a model describes experimental data round plate with diameter 7.48 cm and 1.2 at temperatures 5–25 K range eigenfrequencies 11–300 kHz. The takes into account both due interaction acoustic wave thermal phonons (Akhieser damping). Thermoelastic processes determine below 120 At larger...
Abstract The patterns of longitudinal I c fluctuations in 12 mm wide manufactured high-temperature superconductor tapes are compared with those obtained after slitting the to widths 6 mm, 4 and 3 respectively. In statistical analysis ( x ) data, overall critical current, , ovrl was first calculated. case fluctuating is lower than average aver . Also, dissipation concentrates ‘weak spots’ reduced current. A simple model allows us estimate thermal runaway tr at which weakest location would...
Here, we studied the crystallographic and superconducting properties of niobium thin films grown by pulsed laser deposition. Depending on fluence our samples showed a critical temperature up to 8.4 K current densities 3.0 · 106 A/cm2 at 4.2 K. X-ray diffraction measurements TEM images suggest granular structure with preferred orientation (110) lattice plane parallel substrate surface. The are significantly influenced this granularity oxygen content in film. We discuss dependence density...
Abstract The development of rare-earth barium copper oxide (REBCO) coated conductors with an extremely high critical current density under ultra-high fields opens up a high-field path towards large-scale fusion. latest technology has inspired cable-in-conduit such as conductor on round core wires, twisted stacked tape cables and Rutherford outstanding current-carrying capacities. In order to realise inductance balance decrease magnetic diffusion, these have been or folded certain extent,...
DyBa2Cu3O7-δ (DyBCO) films were grown on biaxially-textured MgO buffer layers deposited Hastelloy substrates, typical critical current densities (Jc) 2.1 MA cm-2 at 77 K in self-field. Biaxial texturing and the orientation relationship of DyBCO with respect to Inclined Substrate Deposition layer investigated using plan-view cross-section Transmission Electron Microscopy (TEM). A detailed analysis microstructural parameters will be summarized. Despite large lattice mismatch (8.5%) grows...
We have developed different kinds of planar high-temperature superconducting dc-SQUID gradiometers with performances suitable for various applications in unshielded environments. Robust small sensors were realized non-destructive evaluation. Their long-term stability was improved by new passivation technologies. For biomagnetic measurements the required higher field sensitivity environments gave rise to many technological problems. Some solutions crossovers, low-ohmic contact layers and...