Bilayer Two-Orbital Model of L a 3 N i 2 O 7 under Pressure

Bilayer Two-Orbital Model of L a 3 N i 2 O 7 under Pressure The newly discovered Ruddlesden-Popper bilayer ${\mathrm{La}}_{3}{\text{Ni}}_{2}{\mathrm{O}}_{7}$ reaches a remarkable superconducting transition temperature ${T}_{c}\ensuremath{\approx}80\text{ }\text{ }\mathrm{K}$ under a pressure of above 14 GPa. Here we propose a minimal bilayer two-orbital model of the high-pressure phase of ${\mathrm{La}}_{3}{\text{Ni}}_{2}{\mathrm{O}}_{7}$. Our model is constructed with the Ni-$3{d}_{{x}^{2}\ens...