Capping Effects on Spin and Charge Excitations in Parent and Superconducting Nd1-xSrx⁢NiO2

Fan, S.; LaBollita, H.; Gao, Q.; Khan, N.; Gu, Y.; Kim, T.; Li, J.; Bhartiya, V.; Li, Y.; Sun, W.; Yang, J.; Yan, S.; Barbour, A.; Zhou, X.; Cano, A.; Bernardini, F.; Nie, Y.; Zhu, Z.; Bisogni, V.; Mazzoli, C.; Botana, A.  S.; Pelliciari, J.

doi:10.1103/physrevlett.133.206501

Title: Capping Effects on Spin and Charge Excitations in Parent and Superconducting Nd_1-xSr_x⁢NiO₂

Journal Article · 12 November 2024 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.133.206501 · OSTI ID:2477567

^[1]; LaBollita, H. ^[2]; Gao, Q. ^[3]; Khan, N. ^[4]; Gu, Y. ^[1];

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^[5]; Yang, J. ^[5]; Yan, S. ^[5]; Barbour, A. ^[1];

^[6]; Cano, A. ^[7];

^[8]; Nie, Y. ^[5]; Zhu, Z. ^[6];

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Brookhaven National Laboratory (BNL), Upton, NY (United States)
Arizona State University, Mesa, AZ (United States)
Chinese Academy of Sciences, Beijing (China)
Rutgers University, Piscataway, NJ (United States)
Nanjing University (China)
Chinese Academy of Sciences, Beijing (China); Songshan Lake Materials Laboratory, Dongguan (China)
Université Grenoble Alpes (France)
Università di Cagliari, Monserrato (Italy)

Superconductivity in infinite layer nickelates Nd_1-x⁢Sr_xNiO₂ has so far been achieved only in thin films, raising questions on the role of substrates and interfaces. Given the challenges associated with their synthesis it is imperative to identify their intrinsic properties. We use resonant inelastic x-ray scattering to investigate the influence of the SrTiO₃ capping layer on the excitations of Nd_1-x⁢Sr_x⁢NiO₂ (x =0 and 0.2). Spin excitations are observed in parent and 20% doped Nd_1-xSr_x⁢NiO₂ regardless of capping, proving that magnetism is intrinsic to infinite-layer nickelates and appears in a significant fraction of their phase diagram. In parent and superconducting Nd_1-xSr_x⁢NiO₂, the spin excitations are slightly hardened in capped samples compared to the noncapped ones. Additionally, a weaker Ni-Nd charge transfer peak at ~0.6 eV suggests that the hybridization between Ni 3⁢d and Nd 5⁢d orbitals is reduced in capped samples. In conclusion, from our data, capping induces only minimal differences in Nd_1-xSr_xNiO₂ and we phenomenologically discuss these differences based on the reconstruction of the SrTiO₃-NdNiO₂ interface and other mechanisms such as crystalline disorder.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); National Natural Science Foundation of China; Chinese Academy of Sciences; National Key Research and Development Program of China; National Basic Research (Key R&D) Program of China; National Science Foundation (NSF)

Grant/Contract Number:: SC0012704

OSTI ID:: 2477567

Report Number(s):: BNL--226334-2024-JAAM

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 20 Vol. 133; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Density functional theory
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Title: Capping Effects on Spin and Charge Excitations in Parent and Superconducting Nd1-xSrx⁢NiO2

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References (53)

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Title: Capping Effects on Spin and Charge Excitations in Parent and Superconducting Nd_1-xSr_x⁢NiO₂