Presentation Information
[PC6-07-INV]Strain-tuning for superconductivity in bilayer nickelate thin films
*Motoki Osada1 (1. University of Tokyo (Japan))
Keywords:
Nickelate,Thin film
The recent discovery of high-transition temperature (Tc) superconductivity in pressurized La3Ni2O7 bulk crystals [1] has attracted keen attention for its characteristic energy diagram of eg orbitals containing nearly half-filled d3z2–r2 and quarter-filled dx2–y2 orbitals [2,3]. This finding provides valuable insights into the orbital contributions and interlayer interactions in double NiO6 octahedrons that further provides a chance to control the electronic structure via varying ligand field. Here, we demonstrate that strain-tuning of the Tc over a range of 50 K with La3Ni2O7 films on different oxide substrates under 20 GPa [4]. As the c/a ratio increases, the onset Tc systematically increases from 10 K in the tensile-strained film on SrTiO3 to the highest value about 60 K in the compressively strained film on LaAlO3. These systematic variations suggest that strain-engineering is a promising approach for expanding the superconductivity in bilayer nickelates with tuning the energy diagram for achieving high-Tc superconductivity.
[1] H. Sun et al., Nature 621, 493 (2023).
[2] M. Nakata, D. Ogura, H. Usui, & K. Kuroki. Phys. Rev. B 95, 214509 (2017).
[3] H. Sakakibara, N. Kitamine, M. Ochi, & K. Kuroki. Phys. Rev. Lett. 132, 106002 (2024).
[4] M. Osada et al., Commun. Phys. 8, 251 (2025).
[1] H. Sun et al., Nature 621, 493 (2023).
[2] M. Nakata, D. Ogura, H. Usui, & K. Kuroki. Phys. Rev. B 95, 214509 (2017).
[3] H. Sakakibara, N. Kitamine, M. Ochi, & K. Kuroki. Phys. Rev. Lett. 132, 106002 (2024).
[4] M. Osada et al., Commun. Phys. 8, 251 (2025).