2025/08/25 by Onari, Seiichiro, Inoue, Daisuke, Tazai, Rina +2 · 1 citation
#FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con)
paper · doi:10.48550/arxiv.2508.17668
Recently discovered high-Tc superconductivity in thin-film bilayer nickelates La3Ni2O7 under ambient pressure has attracted great interest. Non-Fermi-liquid transport behaviors, such as T-linear resistivity and positive Hall coefficient increasing at low temperatures, have been reported in this system. In this study, we analyze the non-Fermi-liquid transport phenomena in the thin-film bilayer nickelate La3Ni2O7 using a multiorbital tight-binding model. In La3Ni2O7, the orbital-selective cold spots composed of Ni dx2-y2 orbital emerge since the spin fluctuations cause stronger quasi-particle damping γ in the Ni dz2 orbital. Notably, in the present study, we derive a rigorous formula for the Hall coefficient RH incorporating the γ in the quasi-quantum metric (qQM) term. We discover that the T-dependence of γ in the qQM term is important in determining RH, and that the qQM term is inevitably enhanced by the nearly degenerate bands at the orbital-selective cold spots located around (π/4,π/4). Moreover, the qQM term plays an essential role in describing the Nernst coefficient and other transport phenomena involving the second derivative velocity vμν. La3Ni2O7 provides a novel platform for exploring the physics of the qQM.