2025/08/31 by Logan Bleys, Nicholas Corkill, Bleys, Logan +11
Materials Science · Physics and Astronomy · #Chemical and Physical Properties of Materials #FOS: Physical sciences #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con)
paper · pdf · doi:10.48550/arxiv.2509.00940
openalex publication_date 2025/08/31 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The recent discovery of superconductivity in thin films of the bilayer Ruddlesden-Popper (RP) nickelate La3Ni2O7 (La327) under compressive strain has generated enormous interest, opening up further opportunities to stabilize superconductivity in this class of materials at ambient pressure. To better understand the many-body normal state from which superconductivity arises, it is important to ascertain the nature and role of correlations in its electronic structure. To provide insights into this question, we use a fully charge self-consistent DFT+e-DMFT (eDMFT) approach to study La327 at several compressive strain levels. At the strain level where superconductivity has been observed experimentally (-2%), in contrast with DFT and DFT+U results, the so-called γ pocket emerges and the associated band, of mostly dz2 character, crosses the Fermi level exhibiting `flat band''-like features when dynamical correlations are included. Larger strain levels suppress the γ pocket, which may have implications for superconductivity or its pairing symmetry.