Strain Engineering for High-Temperature Superconductivity in La3Ni2O7

This paper investigates how strain can be used to optimize the superconducting properties of La3Ni2O7 thin films. It uses density functional theory to model the effects of strain on the electronic structure and superconducting transition temperature (Tc). The findings provide insights into the interplay between structural symmetry, electronic topology, and magnetic instability, offering a theoretical framework for strain-based optimization of superconductivity.

• •Strain can be used to tune the electronic structure and superconducting properties of La3Ni2O7.
• •Tensile strain can lead to a Lifshitz transition and increased pairing strength, but also increased magnetic proximity.
• •Compressive strain can enhance Tc, particularly in the I4/mmm phase, due to bond straightening and hole pocket emergence.
• •The study highlights the balance between structural symmetry, electronic topology, and magnetic instability in nickelates.