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Magnetic excitations in Nd𝑛+1⁢ Ni𝑛⁢ O3⁢𝑛+1 Ruddlesden-Popper nickelates observed via resonant inelastic x-ray scattering

Journal Article · · Physical Review. B
 [1];  [1];  [1];  [2];  [1];  [3];  [4];  [5];  [5];  [5];  [6];  [6];  [6];  [6];  [3];  [1];  [1];  [7];  [1]
  1. Harvard Univ., Cambridge, MA (United States)
  2. Harvard Univ., Cambridge, MA (United States); Institute of Science and Technology Austria (ISTA), Klosterneuburg (Austria)
  3. Cornell Univ., Ithaca, NY (United States)
  4. Cornell University
  5. National Synchrotron Light Source II; Brookhaven National Laboratory
  6. Harwell Science and Innovation Campus, Didcot (United Kingdom). Diamond Light Source, Ltd.
  7. Brookhaven National Laboratory (BNL), Upton, NY (United States)
Magnetic interactions are thought to play a key role in the properties of many unconventional superconductors, including cuprates, iron pnictides, and square-planar nickelates. Superconductivity was also recently observed in the bilayer and trilayer Ruddlesden-Popper nickelates, the electronic structure of which is expected to differ from that of cuprates and square-planar nickelates. Here we study how electronic structure and magnetic interactions evolve with the number of layers, 𝑛, in thin film Ruddlesden-Popper nickelates Nd𝑛+1⁢Ni𝑛⁢O3⁢𝑛+1 with 𝑛 = 1,3, and 5 using resonant inelastic x-ray scattering (RIXS). The RIXS spectra are consistent with a high-spin |3⁢𝑑8⁢ $$\underline{𝐿}$$⟩ electronic configuration, resembling that of La2−𝑥⁢Sr𝑥⁢NiO4 and the parent perovskite, NdNiO3. The magnetic excitations soften to lower energy in the structurally self-doped, higher-𝑛 films. In conclusion, our observations confirm that structural tuning is an effective route for altering electronic properties, such as magnetic superexchange, in this prominent family of materials.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), Office of Workforce Development for Teachers & Scientists (WDTS)
Grant/Contract Number:
SC0012704; SC0014664; SC0021925
OSTI ID:
2568104
Alternate ID(s):
OSTI ID: 2561500
Report Number(s):
BNL--228205-2025-JAAM
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 16 Vol. 111; ISSN 2469-9950; ISSN 2469-9969
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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