Swedish-Ukranian workshop on science and technology of superconductivity

26 Oct 2026, 08:30 → 27 Oct 2026, 18:00 Europe/Stockholm

Häggsallen (Ångström Laboratory)

Mats Larsson (Stockholm University), Vitaliy Goryashko (Uppsala University)

Scope:

Superconducting (SC) and low-temperature quantum systems are transforming our understanding of matter, energy, and information. SC technologies are part of the transition to a green society through energy saving in high-power applications as, for example, SC accelerators and high-Tc SC power lines. The Swedish-Ukrainian symposium provides a platform for discussing novel and emergent phenomena in the applied superconductivity,  in particular for applications in future accelerators. 

 

The aims of the workshop are: 

• to gather scientists who often work separately — those in the high-level theory of superconductivity, those developing present and emerging applications, and those deploying SC systems in industry and big-science projects. 
• to bring our Ukrainian colleagues into a stimulating scientific environment for allowing sustained discussion and exchange that the situation at home makes difficult to sustain;
• to organize a platform to potential collaborations with Ukrainian colleagues in the physics and technology of superconductivity.

 

Chairs:

• Vitaliy Goryashko (Uppsala University,  Sweden)
• Mats Larsson (Stockholm University, Sweden)
• Larissa Brizhik (Bogolyubov Institute for Theoretical Physics, Ukraine)

 

Local Organizers:

• Vitaliy Goryashko

 

Rooms at Botanika hotel (click the for details) are booked for invited speakers.

The workshop dinner will take place at the restaurant Stationen (click for details) on Monday at 18:00.

 

 

The event is supported by:
 

Hosted by: 

 

Participation is free of charge. Coffee and snacks are provided.

Monday, 26 October

Registration

Welcome words

Conveners: Maja Olvegård (Uppsala University), Mats Larsson (Stockholm University), Vitaliy Goryashko (Uppsala University, Sweden)

Plenary talks: SC accelerator technology

Convener: Prof. Mats Larsson (Stockholm University)

1 FREIA Laboratory

Speaker: Rocio Santiago Kern (Uppsala University)

2 SC Accelerator Magnets: from fundamentals to a novel uni-layer design

Speakers: Dr Davide Cuneo (FREIA), Rocio Santiago Kern (Uppsala University)

3 Characterization of superconducting cavities at FREIA Laboratory

Speakers: Mykhailo Zhovner (FREIA, UU), Peter Salén (U)

10:30 Coffee break

Plenary talks: Theoretical aspects of SC

Convener: Prof. Vitaliy Goryashko (Uppsala University, Sweden)

4 Development of superconducting resonators for fundamental physics

Speaker: Dr Akira Miyazaki (IJCLab, Paris-Saclay University)

5 Compact fluxons in Josephson junction ladder

Speaker: Dr Yaroslav Zolotaryuk (Bogolyubov Institute)

6 The Fluxon Interaction with a Qubit in a Discrete Josephson Transmission Line

Speaker: Dr Ivan Starodub (Bogolyubov Institute)

Lunch

Tour to the FREIA Laboratory

Conveners: Dr Iaroslava Profatilova (FREIA, UU), Mykhailo Zhovner (FREIA, UU), Prof. Vitaliy Goryashko (Uppsala University, Sweden)

Plenary talks: Novel SC materials

7 Metallized DNA: from a macromolecule to a functional material

Speaker: Prof. Sergiy Perepelytsya (Bogolyubov Institute)

8 Polymers and macromolecules as novel SC materials

Speaker: Prof. Larissa Brizhik (Bogolyubov Institute)

15:15 Coffee break

Plenary talks: SRF technology

9 PERLE Multi-Turn ERL

Speaker: Dr Alex Fomin (Université Paris-Saclay, CNRS/IN2P3 IJCLab, Orsay, France)

10 SRF coatings and thin-film technology

Speaker: Dr Cristian Pira (INFN-LNL, Italy:)

11 Superconducting accelerator magnets and their quench protection

Speaker: Dr Tiina Salmi (Tampere University)

12 Superconducting Technologies for Free-Electron Lasers

Speaker: Dr Alan Mak (National Centre for Nuclear Research (NCBJ))

Practical information

Convener: Prof. Vitaliy Goryashko (Uppsala University, Sweden)

Tuesday, 27 October

Plenary talks

13 Quantum computing and entanglement of multi-qubit states

Speaker: Prof. Khrystyna Gnatenko (Ivan Franko National University of Lviv)

14 Photon detection with microwave Josephson photomultipliers

Speaker: Dr Eugene Stolyarov (Bogolyubov Institute for Theoretical Physics)

15 Revisiting high-Tc superconductivity: old questions and new perspectives

Speaker: Prof. Alexander Kordyuk (Kyiv Academic University)

10:30 Coffee Break

Plenary talks

16 Anomalous Lattice Expansion and Superconductivity in Epitaxial V/MgO

Speaker: Sven Backlund (UU)

17 Superconducting instabilities in altermagnets: A perspective from minimal models

Speaker: Prof. Andreas Kreisel (Uppsala Universitet)

18 Chiral d-wave superconductors for quantum technology: engineering edge currents, vortex-skyrmions and fractional vortices

Speaker: Dr Patric Holmvall (UU)

12:30 Lunch

Plenary talks

19 The example of the bad usage of great ideas: invisible Cooper pairs

Speaker: Prof. Alexander Gabovich (Institute of Physics of the NAS of Ukraine)

20 Latent high-temperature spin-triplet superconductivity of half-metallic manganites - a platform for quantum materials with unique superconducting properties

Speaker: Vladimir Krivoruchko (Donetsk Institute for Physics and Engineering named after O. O. Galkin)

21 Flux Pumps — the efficient way to energise DC magnets in the golden era of HTS

Flux pumps are devices able to energise superconducting magnets with no conductor crossing the cryostat wall: a time-varying field and a region of controllable resistance drive DC into a closed loop.After a brief account of how flux pumps developed, a review of the mechanisms available in HTS and the resulting taxonomy are presented: rotating and linear travelling-wave flux pumps, transformer–rectifier flux pumps with their switches, and self-switching bridges, with the trade-offs that make a flux pump something designed around its magnet. A brief energy and efficiency assessment shows that, although their instantaneous efficiency is modest, flux pumps run intermittently, so what counts is the energy consumed over the magnet’s whole duty cycle. Finally, three fields of application are examined: fusion toroidal-field coils and stellarator coils, magnetic shielding and electric propulsion for space applications, and magnetic resonance imaging.

Speaker: Prof. Simone Minucci (Universitas Mercatorum, Italy)

15:00 Coffee break

Plenary talks

22 Unconventional superconductivity and possible triplet pairing in rare-rarth borides

Rare-earth borides provide a particularly interesting platform for investigating superconductivity in the presence of magnetic order. The coexistence and competition of these two collective states may lead to behavior that goes beyond the conventional spin-singlet BCS scenario and, under appropriate conditions, may favor unconventional pairing mechanisms. Such systems are of fundamental interest for investigating magnetically mediated superconductivity and possible spin-triplet pairing, with potential relevance to spintronics and topological quantum technologies, particularly in the context of Majorana-state realization.
In the RRh4B4 family, where R denotes a rare-earth element, the interplay between magnetism and superconductivity can be effectively controlled through chemical substitution. In the Dy1−xYxRh4B4 series, replacing magnetic Dy with non-magnetic Y causes a pronounced reduction of the magnetic ordering temperature, whereas the superconducting transition temperature increases. Heat-capacity measurements indicate the occurrence of an additional magnetic transition below Tc, demonstrating that magnetic ordering can develop inside the superconducting state without immediately suppressing it. These compounds also exhibit a number of unusual superconducting properties, including the paramagnetic Meissner (Wohlleben) effect [1-2] and non-monotonic temperature dependences of both the upper critical field and the superconducting energy gap [3]. The observed features collectively indicate a complex interplay between magnetic order and superconductivity and point to a possible unconventional superconducting pairing mechanism, quite possibly of the spin-triplet type.
Additional evidence for unconventional behavior is obtained in Ru-substituted rare-earth rhodium borides. In the ferromagnetic superconductor Dy0.6Y0.4Rh3.85Ru0.15B4, superconductivity persists in the presence of ferromagnetic order [4], while point-contact Andreev-reflection measurements yield 2Δ/kBTc > 4, exceeding the weak-coupling BCS value [5]. Furthermore, the upper critical field Hc2(T) of Dy0.8Er0.2Rh3.8Ru0.2B4 exhibits a characteristic inflection near 3 kOe [6]. This feature may be associated with low-temperature magnetic ordering. However, a more unconventional scenario involving a change in the superconducting pairing state, including a possible crossover from singlet to triplet pairing, cannot be excluded.
The combination of ferromagnetism and superconductivity, anomalous Hc2(T) behavior, enhanced superconducting gap values, and other non-BCS features makes these rare-earth borides promising systems for further investigation of unconventional superconductivity. Although the available results do not provide direct proof of spin-triplet pairing, they identify a set of experimental signatures that justify further searches for a possible triplet superconducting state in this class of materials.

Speaker: Dr Andrii Terekhov (Department of Point-Contact Spectroscopy B. Verkin Institute for Low Temperature Physics and Engineering of NASU)

23 SC accelerator development at Darmstadt University

Speaker: Dr Dorothea Fonnesu (Technical University of Darmstadt)

24 Workshop Summary

Speaker: Prof. Vitaliy Goryashko (Uppsala University, Sweden)