Electronic correlation and pseudogap-like behavior of high-temperature superconductor La3Ni2O7

Journal article

High-temperature superconductivity (HTSC) remains one of the most challenging and fascinating mysteries in condensed matter physics. Recently, superconductivity with transition temperature exceeding liquid-nitrogen temperature is discovered in La3Ni2O7 at high pressure, which provides a new platform to explore the unconventional HTSC. In this work, using high-resolution angle-resolved photoemission spectroscopy and ab initio calculation, we systematically investigate the electronic structures of La3Ni2O7 at ambient pressure. Our experiments are in nice agreement with ab initio calculations after considering an orbital-dependent band renormalization effect. The strong electron correlation effect pushes a flat band of dz2 orbital component below the Fermi level (EF), which is predicted to locate right at EF under high pressure. Moreover, the dx2–y2 band shows pseudogap-like behavior with suppressed spectral weight and diminished quasiparticle peak near EF. Our findings provide important insights into the electronic structure of La3Ni2O7, which will shed light on understanding of the unconventional superconductivity in nickelates.

Authors: Li, Y; Du, X; Cao, Y; Pei, C; Zhang, M

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: IOP Publishing
• Journal: Chinese Physics Letters
• Volume: 41
• Issue: 8
• Article number: 087402
• Publication date: 2024-08-01
• Acceptance date: 2024-07-12
• DOI: 10.1088/0256-307x/41/8/087402
• EISSN: 1741-3540
• ISSN: 0256-307X
• Language: English