Revealing superconducting gap in La₃Ni₂O_7-δ by Andreev reflection spectroscopy under high pressure.

ABSTRACT: The recent discovery of compressed superconductivity at 80 K in La₃Ni₂O_7-δ has brought nickelates into the family of unconventional high-temperature superconductors. However, due to the challenges of directly probing the superconducting pairing mechanism under high-pressure, the pairing symmetry and gap structures of nickelate superconductors remain under intense debate. In this work, we successfully determine the microscopic information on the superconducting gap structure of La₃Ni₂O_7-δ samples subjected to pressures exceeding 20 GPa, by constructing different conductance junctions within diamond anvil cells. By analyzing the temperature-dependent differential conductance spectra within the Blonder-Tinkham-Klapwijk (BTK) mo

SUBMITTER: Guo J 

PROVIDER: S-EPMC12672831 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature