Electronic structure of superconducting infinite-layer lanthanum nickelates DOI Creative Commons
Wenjie Sun, Zhicheng Jiang, Chengliang Xia

et al.

Science Advances, Journal Year: 2025, Volume and Issue: 11(4)

Published: Jan. 22, 2025

Revealing the momentum-resolved electronic structure of infinite-layer nickelates is essential for understanding this class unconventional superconductors but has been hindered by formidable challenges in improving sample quality. In work, we report angle-resolved photoemission spectroscopy superconducting La 0.8 Sr 0.2 NiO 2 films prepared molecular beam epitaxy and situ atomic-hydrogen reduction. The measured Fermi topology closely matches theoretical calculations, showing a large Ni d x 2 − y –derived sheet that evolves from hole-like to electron-like along k z three-dimensional (3D) electron pocket centered at Brillouin zone corner. bands show mass enhancement ( m */ DFT ) 3, while 3D band shows negligible renormalization. Moreover, states also display dispersion anomaly higher binding energy, reminiscent waterfall feature kinks observed cuprates.

Language: Английский

Electronic structure of superconducting infinite-layer lanthanum nickelates DOI Creative Commons
Wenjie Sun, Zhicheng Jiang, Chengliang Xia

et al.

Science Advances, Journal Year: 2025, Volume and Issue: 11(4)

Published: Jan. 22, 2025

Revealing the momentum-resolved electronic structure of infinite-layer nickelates is essential for understanding this class unconventional superconductors but has been hindered by formidable challenges in improving sample quality. In work, we report angle-resolved photoemission spectroscopy superconducting La 0.8 Sr 0.2 NiO 2 films prepared molecular beam epitaxy and situ atomic-hydrogen reduction. The measured Fermi topology closely matches theoretical calculations, showing a large Ni d x 2 − y –derived sheet that evolves from hole-like to electron-like along k z three-dimensional (3D) electron pocket centered at Brillouin zone corner. bands show mass enhancement ( m */ DFT ) 3, while 3D band shows negligible renormalization. Moreover, states also display dispersion anomaly higher binding energy, reminiscent waterfall feature kinks observed cuprates.

Language: Английский

Citations

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