Electronic Structure of Superconducting Infinite-Layer Lanthanum Nickelates
arxiv(2024)
摘要
Revealing the momentum-resolved electronic structure of infinite-layer
nickelates is essential for understanding this new class of unconventional
superconductors, but has been hindered by the formidable challenges in
improving the sample quality. In this work, we report for the first time the
angle-resolved photoemission spectroscopy of superconducting
La_0.8Sr_0.2NiO_2 films prepared by molecular beam epitaxy and
in situ atomic-hydrogen reduction. The measured Fermi
topology closely matches theoretical calculations, showing a large
Ni-d_x^2-y^2 derived Fermi sheet that evolves from hole-like to
electron-like along k_z, and a three-dimensional (3D) electron pocket
centered at Brillouin zone corner. The Ni-d_x^2-y^2 derived bands show a
mass enhancement (m^*/m_DFT) of 2-3,while the 3D electron band shows
negligible band renormalization. Moreover, the Ni-d_x^2-y^2 derived states
also display a band dispersion anomaly at higher binding energy, reminiscent of
the waterfall feature and kinks observed in cuprates.
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