paper

Possible Liquid-Nitrogen-Temperature Superconductivity Driven by Perpendicular Electric Field in the Single-Bilayer Film of La $_{3}$ Ni $_{2}$ O $_{7}$ at Ambient Pressure

arXiv:2411.13554 · doi:10.1038/s41467-025-67880-5

Abstract

Recently, high-temperature superconductivity (HTSC) is found in the La $_{3}$ Ni $_{2}$ O $_{7}$ /SrLaAlO $_{4}$ ultrathin film with critical temperature $T_{c}$ above the McMillan limit at ambient pressure (AP). It is eager to enhance $T_{c}$ of La $_{3}$ Ni $_{2}$ O $_{7}$ at AP. We propose that a perpendicular electric field strongly enhances $T_{c}$ in the single-bilayer film of La $_{3}$ Ni $_{2}$ O $_{7}$ at AP. Under electric field, the layer with lower potential energy will accept electrons flowing from the other layer to fill in the Ni- $3 d_{x^{2} - y^{2}}$ orbitals, as the nearly half-filled Ni- $3 d_{z^{2}}$ orbital cannot accommodate more electrons. With the enhancement of the filling fraction in the $3 d_{x^{2} - y^{2}}$ orbitals in this layer, the interlayer $s$ -wave pairing is suppressed, but the intralayer $d$ -wave pairing in this layer is strongly enhanced. We numerically verify this idea and yield that an imposed voltage of about $0.1 \sim 0.2$ volt between layers is enough to realize liquid-nitrogen-temperature HTSC in this single bilayer at AP. Our results appeal for experimental verification.

Version published in Nature Communications

Possible Liquid-Nitrogen-Temperature Superconductivity Driven by Perpendicular Electric Field in the Single-Bilayer Film of La3​Ni2​O7​ at Ambient Pressure

Abstract

Possible Liquid-Nitrogen-Temperature Superconductivity Driven by Perpendicular Electric Field in the Single-Bilayer Film of La $_{3}$ Ni $_{2}$ O $_{7}$ at Ambient Pressure