paper

Collective spin excitations in trilayer nickelate La $_{4}$ Ni $_{3}$ O $_{10}$

arXiv:2604.04643

Abstract

Ruddlesden-Popper (RP) nickelates have recently emerged as a new family of high-temperature superconductors. In bilayer RP nickelates, magnetic excitations with large exchange couplings have been observed, supporting a spin-mediated pairing mechanism. Whether comparable spin correlations persist in trilayer nickelates, however, remains unknown. Here, we present a Ni $L$ -edge resonant inelastic X-ray scattering (RIXS) study of La $_{4}$ Ni $_{3}$ O $_{10}$ single crystals. While the orbital excitations remain similar to those of La $_{3}$ Ni $_{2}$ O $_{7}$ , the collective spin excitations in La $_{4}$ Ni $_{3}$ O $_{10}$ exhibit a comparable bandwidth of about $60$ meV but substantially suppressed spectral weight, implying a weaker electronic correlation in the trilayer compounds. Our results underscore the three-dimensional and multi-orbital electronic character in La $_{4}$ Ni $_{3}$ O $_{10}$ , highlighting important differences from the bilayer nickelates. These findings provide crucial insights into the evolution of magnetism across the RP nickelate family and its connection to superconductivity.

Supplementary Information available upon request

Collective spin excitations in trilayer nickelate La4​Ni3​O10​

Abstract

Collective spin excitations in trilayer nickelate La $_{4}$ Ni $_{3}$ O $_{10}$