Visualization of oxygen vacancies and self-doped ligand holes in La3Ni2O7−δ

The recent discovery of superconductivity in La 3 Ni 2 O 7− δ under high pressure with a transition temperature around 80 K (ref. 1 ) has sparked extensive experimental 2 – 6 and theoretical efforts 7 – 12 . Several key questions regarding the pairing mechanism remain to be answered, such as the mos...

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