SPICE Workshop on Quantum Matter for Quantum Technologies, May 21st - May 23rd 2024
Javier Villegas
D. Sanchez-Manzano1,2, S. J. Carreira2, H. Hassan2, A. Lagarrigue2,S. Mesoraca2, M.-W. Yoo2, F. A. Cuellar1, M. Cabero3, V. Rouco1,2 , G. Orfila1, X. Palermo2, A. Balan2, K. Seurre2, L. Marcano4, A. Sander2, M. Rocci1, J. Garcia-Barriocanal1, F. Gallego1, J. Tornos1, A. Rivera1, F. Mompean5, M. Garcia-Hernandez5, J. M. Gonzalez-Calbet3, C. Leon1, S. Valencia1, C. Feuillet-Palma6, N. Bergeal6, A. I. Buzdin7, J. Lesueur6, A. Anane2, J. Santamaria1 & Javier E. Villegas2*
1GFMC, Departamento Fisica de Materiales, Facultad de Fisica, Universidad Complutense, Madrid, Spain
2Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, Palaiseau, France
3Centro Nacional de Microscopia Electronica, Universidad Complutense, Madrid, Spain
4Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany
5Instituto de Ciencia de Materiales de Madrid (ICMM, CSIC), Cantoblanco, Spain
6Laboratoire de Physique et d’Etude des Matériaux, ESPCI Paris, CNRS, PSL Research University, Sorbonne University, Paris, France
7LOMA, CNRS, Université Bordeaux, Talence, France
Corresponding author: Javier.villegas@cnrs-thales.fr
Superconductivity and magnetism are antagonistic phenomena whose competing interaction results in novel states and unusual properties that, beyond their fundamental interest, present much potential for rupture quantum technologies. One of the promising examples is the so-called superconducting spintronics, which aims at marrying the spin-polarized transport characteristic of ferromagnets with the dissipation-less, quantum-coherent transport of superconductors. We will focus on two different facets of that problem. On the one hand, we will describe experiments on the propagation of superconducting correlations into ferromagnets. In particular, we will demonstrate long-range Josephson coupling across the half-metallic manganite La0.7Sr0.3MnO3 combined with the high-temperature superconducting d-wave cuprate YBa2Cu3O7. That is shown in planar junctions that display large critical currents and the hallmark Josephson characteristics: modulation of the critical current due to magnetic flux quantization and quantum phase-locking effects under microwave excitation [1,2]. On the other hand, we will detail experiments on spin diffusion into superconductors. This is investigated using wideband ferromagnetic resonance in superconductor/ferromagnet bilayers and detected by measurements of the Gilbert damping and Inverse Spin Hall Effect (ISHE). These experiments demonstrate the important role of Bogolioubov quasiparticles in spin transport [3] and unveil gigantic spin Hall effect signals across the superconducting transition, both in conventional and unconventional superconductors [4].
Work supported by French ANR “SUPERFAST”, Spanish AEI grant PID2020-118078RB-I00, and by Regional Government of Madrid CAM through SINERGICO Project Y2020/NMT-6661 CAIRO-CM. We acknowledge funding from Flag ERA ERA-NET To2Dox Project
[1] D. Sanchez-Manzano et al., Extremely Long-Range, High-Temperature Josephson Coupling across a Half-Metallic Ferromagnet, Nat. Mater. 21, 188 (2022).[2] D. Sanchez-Manzano et al., Unconventional Long Range Triplet Proximity Effect in Planar YBa2Cu3O7/La0.7Sr0.3MnO3/YBa2Cu3O7 Josephson Junctions, Supercond. Sci. Technol. 36, 074002 (2023).
[3] S. J. Carreira et al. , Spin Pumping in d -Wave Superconductor-Ferromagnet Hybrids, Phys. Rev. B 104, 144428 (2021).
[4] S.J. Carreira et al, unpublished.