Magnetic excitations in strained infinite-layer nickelate PrNiO<sub>2</sub> films.
basic_science · Level V
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- Record sourced from PubMed, PMID 38956078.
- Also identified by DOI 10.1038/s41467-024-49940-4 and PMC identifier 11220032.
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Abstract
Strongly correlated materials respond sensitively to external perturbations such as strain, pressure, and doping. In the recently discovered superconducting infinite-layer nickelates, the superconducting transition temperature can be enhanced via only ~ 1% compressive strain-tuning with the root of such enhancement still being elusive. Using resonant inelastic x-ray scattering (RIXS), we investigate the magnetic excitations in infinite-layer PrNiO<sub>2</sub> thin films grown on two different substrates, namely SrTiO<sub>3</sub> (STO) and (LaAlO<sub>3</sub>)<sub>0.3</sub>(Sr<sub>2</sub>TaAlO<sub>6</sub>)<sub>0.7</sub> (LSAT) enforcing different strain on the nickelates films. The magnon bandwidth of PrNiO<sub>2</sub> shows only marginal response to strain-tuning, in sharp contrast to the enhancement of the superconducting transition temperature T<sub>c</sub> in the doped superconducting samples. These results suggest the bandwidth of spin excitations of the parent compounds is similar under strain while T<sub>c</sub> in the doped ones is not, and thus provide important empirics for the understanding of superconductivity in infinite-layer nickelates.