CMD30 FisMat2023 - Submission - View

Abstract title: Possible triplet superconductivity in superconductor-ferromagnet van der Waals bilayers with spiral magnetization
Submitting author: Elke Scheer
Affiliation: University of Konstanz
Affiliation Address: Department of Physics, Universitätsstraße 10, 78464 Konstanz
Country: Germany
Other authors and affiliations: Spuri Alfredo , Nikolic, Danilo, Chakraborty Subrata, Belzig Wolfgang, Di Bernardo Angelo all: Department of Physics, University of Konstanz, Universitätsstraße 10, 78464 Konstanz, Germany
Abstract
The helimagnetic metal Cr1/3NbS2 has been reported to host soliton excitations based on magnetransport measurements which have been performed on flakes of this material down to the 2D limit [1,2]. Investigating the proximity effect between 2D flakes of such a magnetic material and conventional 2D superconductors could lead to the discovery of unconventional spin-triplet superconducting states [3-5], with possible applications for superconducting spintronics and quantum computing. Based on this motivation, we have fabricated 2D Cr1/3NbS2/NbS2 bilayers and investigated their low-temperature magnetotransport properties. Studying the evolution of the superconducting critical temperature (Tc) of devices based on Cr1/3NbS2/NbS2 bilayers as a function of the magnetic state of Cr1/3NbS2, we find that the Tc of the bilayer strongly depends on the Cr1/3NbS2 magnetization, in a way that cannot be explained as the result of a conventional short-ranged S/F proximity effect or of stray fields. Supported by a theoretical model, we show that our results are consistent with the generation of long-ranged spin-triplet pairs across the 2D vdW interface forming between the NbS2 and Cr1/3NbS2 flakes.References:
  1. S. Tang, R. S. Fishman, S. Okamoto, J. Yi, Q. Zou, M. Fu, A. P. Li, D. Mandrus, and Z. Gai, Nano Lett. 18, 4023 (2018).
  2. L. Wang, N. Chepiga, D. Ki, L. Li, F. Li, W. Zhu, Y. Kato, O. S. Ovchinnikova, F. Mila, I. Martin, D. Mandrus, and A. F. Morpurgo, Phys. Rev. Lett. 118, 257203 (2017).
  3. See e.g.: J. Linder, and J. W. A. Robinson, Nat. Phys. 11, 307 (2015).
  4. R. Cai, Y. Yao, P. Lv, Y. Ma, W. Xing, B. Li, Y. Ji, H. Zhou, C. Shen, S. Jia, X. C. Xie, I. Zutic, Q. F. Sun, and W. Han, Nat. Commun. 12, 6725 (2021).
  5. G. Hu, C. Wang, S. Wang, Y. Zhang, Y. Feng, Z. Wang, Q. Niu, Z. Zhang, and B. Xiang, Nat. Commun. 14, 1779 (2023).