Recent progress on iron-based superconductors: potentials for high-field applications.

1. Recent progress on iron-based superconductors: potentials for high-field applications. M. Putti University of Genova& CNR-Spin

2. What'snew in the last year on : • IBS families • Thinfilms • Coatedconductors • PIT wires & tapes

3. IBS families 1144 ( RbCaFe4As4) (K) 112 type (CaFeAs2) 122 ( KFe2Se2) Intercalated FeSe-11

4. 1144 Hc2 1144 Jc H//ab 11 122 H//c H//ab 1111 1144 H//c W. R. Meier, et al., Phys. Rev. B 94, 064501 (2016). C. Tarantini et al., PRB 84, 184522 (2011) SHIV J. SINGH et al. PHYSICAL REVIEW MATERIALS 2, 074802 (2018)

5. Superconducting parameters Width of the critical regime aroundTc

6. S. Ishida et al., npjQuantum Materials (2019) 27

7. Jc in IBS thin films BZO nanoparticlesaddiction in Ba122:P Large Isotropic Field independent Miura et al., Supercond. Sci. Technol. 32 (2019) 064005 But can be furtherlyameliorated

8. Jc dependence on the misorientation angle IBSadvantageous GB over HTS: • Smaller critical angle: • 9° • 4° • At large GB >20° IBS are still metallic whereas Jc of HTS continuously decreases exponentially with GB Universal 9° for all the IBS families (also for 1111) I Iidaet al., Appl Phys Rev 5 (2018) 031304 • I Iidaet al., Supercond. Sci. Technol. 32 (2019) 074003

9. Development of IBS technicalconductors over the years Practicalapplication PIT◼1144 ◼1144 I. Pallecchi, M. Eisterer, A. Malagoli, M. Putti, SUST (2015) 28

10. IBS-CC: State of the art Maintechnologies for ReBCO-CC manufacturing 122 11 1111 I Iidaet al., Appl Phys Rev 5 (2018) 031304

11. Non texturedsubstrate Ingot Texturedsubstrate forno Rolling mill IBS-CC: goingtowardssimplifications of the template 100 nm Fe(Te,Se) deposited by PLD 350 nm CeO2deposited by PDL NiW5%biaxiallytextured • Tc0 ≈ 18K • Hc2slopes are verysharp • Jc = 105 A/cm2 @ 4.2K self field • Jc = 3 104 A/cm2 @ 4.2K , 10 T • Jcisisotropic G. Sylva, et al., SUST 2019 in print

12. IBS-PIT: state of the art • Best performaces for the 122 family • Jcratherflat and in the best samplesclose to 105 A/cm2above 10 T • Best performaces for the 122 family • Jcratherflat and in the best samplesclose to 105 A/cm2above 10 T • Encouragingresults for the 1144 phase CaK-1144 ⬌ Pyon et al., APEX 2018 H.Hosono, et al., Mater. Today 21(2018) 278.

13. IBS-PIT: state of the art • Best performaces for the 122 family • Jcratherflat and in the best samplesclose to 105 A/cm2above 10 T • Best performaces for the 122 family • Jcratherflat and in the best samplesclose to 105 A/cm2above 10 T • Encouragingresults for the 1144 phase • The comparison with othertechnicalsuperconductorsisverypromising C Yao, Y Ma SUST 32 (2019) 023002

14. The world’s first 100 m class IBS wire Multifilamentarywires and tapes Copper sheathed wires and tapes

15. What'snew in the last year on : • IBS families • Thinfilms • Coatedconductors • PIT wires & tapes

16. R&D activities on IBS COLLABORATION activity BETWEEN CERN and CNR-SPIN (ADDENDUM FCC-GOV-CC-0086)V Braccini, G Sylva, A Malagoli, E Bellingeri, C Ferdeghini, M Putti, A Provino, P Manfrinetti A. Ballarino, S.C. Hopkins, A. Lunt PRIN 2017, funded by MIUR M. Putti, G. Sylva, I.Pallecchi, P. Manfrinetti V.BracciniE Bellingeri, C Bernini, V Braccini, G Grimaldi, M Lisitskiy, A Malagoli, A Provino G. Celentano, A Augieri, A Mancini, A Rufoloni, A Vannozzi,ENEA Frascati L.GozzelinoR Gerbaldo, G Ghigo, F Laviano, D Torsello POLITO E. Silva, A Masi, N Pompeo,, G Sotgiu, ROMA3

17. International Workshop Iron-based superconductors: advances towards applications12-14 February 2020, S. Margherita (Genova)www.ibs2app.eu • Topics • Materials • Pinning and vortexmatter • Bulk magnets • Thinfilms and devices • Wires, tapes and CoatedConductors • Chairs • V Braccini (CNR-SPIN), L Gozzelino (PoliTo), E Silva (UniRoma3)