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

Journal Article · · Physical Review Letters
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  1. Brookhaven National Laboratory (BNL), Upton, NY (United States)
  2. Arizona State University, Mesa, AZ (United States)
  3. Chinese Academy of Sciences, Beijing (China)
  4. Rutgers University, Piscataway, NJ (United States)
  5. Nanjing University (China)
  6. Chinese Academy of Sciences, Beijing (China); Songshan Lake Materials Laboratory, Dongguan (China)
  7. Université Grenoble Alpes (France)
  8. Università di Cagliari, Monserrato (Italy)
Superconductivity in infinite layer nickelates Nd1-x⁢SrxNiO2 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 Nd1-x⁢Srx⁢NiO2 (x =0 and 0.2). Spin excitations are observed in parent and 20% doped Nd1-xSrx⁢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 Nd1-xSrx⁢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 Nd1-xSrxNiO2 and we phenomenologically discuss these differences based on the reconstruction of the SrTiO3-NdNiO2 interface and other mechanisms such as crystalline disorder.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
Chinese Academy of Sciences; National Basic Research (Key R&D) Program of China; National Key Research and Development Program of China; National Natural Science Foundation of China; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
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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