Evolution of magnetism in Ruddlesden-Popper bilayer nickelate revealed by muon spin relaxation

K. W. Chen; X. Q. Liu; Y. Wang; Z. Y. Zhu; J. C. Jiao; C. Y. Jiang; Y. F. Guo; L. Shu

paper

Evolution of magnetism in Ruddlesden-Popper bilayer nickelate revealed by muon spin relaxation

arXiv:2412.09003

Abstract

Here we report the positive muon spin relaxation study on Pr-doped La $_{1.9}$ Pr $_{1.1}$ Ni $_{2}$ O $_{6.97}$ and oxygen-deficient La $_{3}$ Ni $_{2}$ O $_{6.63}$ polycrystalline under ambient pressure. Zero-field $μ^{+}$ SR experiments reveal the existence of bulk long-range magnetic order in La $_{1.9}$ Pr $_{1.1}$ Ni $_{2}$ O $_{6.97}$ with $T_{N} = 161 K$ , while La $_{3}$ Ni $_{2}$ O $_{6.63}$ exhibits a short-range magnetic ground state with $T_{N} = 30 K$ . The magnetic transition width of La $_{1.9}$ Pr $_{1.1}$ Ni $_{2}$ O $_{6.97}$ revealed by weak-transverse-field $μ^{+}$ SR is narrower compared to La $_{3}$ Ni $_{2}$ O $_{6.92}$ . Our $μ^{+}$ SR experiment results provide a comprehensive view on the correlation between magnetism and structure perfection in Ruddlesden-Popper bilayer nickelates under ambient pressure.