Evidence of spin density waves in La$_3$Ni$_2$O$_{7-\delta}$

Jiachen Jiao; Kaiwen Chen; Lei Shu; Muyuan Zou; Ningyuan Zhang; Qiong Wu; Xiangqi Liu; Yanfeng Guo; Yixuan Luo

Evidence of spin density waves in La$_3$Ni$_2$O$_{7-\delta}$

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arxiv 2311.15717 v2 pith:OREXRZTB submitted 2023-11-27 cond-mat.str-el cond-mat.supr-con

Kaiwen Chen , Xiangqi Liu , Jiachen Jiao , Muyuan Zou , Yixuan Luo , Qiong Wu , Ningyuan Zhang , Yanfeng Guo

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Lei Shu

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classification cond-mat.str-elcond-mat.supr-con

keywords deltafieldmagneticpressurespinunderadditionambient

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abstract

The recently discovered superconductivity with critical temperature $T_c$ up to 80 K in the double-layer Nickelate La$_3$Ni$_2$O$_{7-\delta}$ under pressure has drawn great attention. Here we report the positive muon spin relaxation ($\mu^+$SR) study of polycrystalline La$_3$Ni$_2$O$_{6.92}$ under ambient pressure. Zero-field $\mu^+$SR experiments reveal the existence of magnetic order in La$_3$Ni$_2$O$_{6.92}$ with $T_{N}=154\ \rm{K}$. The weak transverse field $\mu^+$SR measurements confirms the bulk nature of magnetism. In addition, a small quantity of oxygen deficiencies can greatly broaden the internal magnetic field distribution sensed by muons.

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Orbital correlations in bilayer nickelates: roles of doping and interlayer coupling
cond-mat.str-el 2025-02 conditional novelty 5.0 of 10

In a two-orbital RPA model of La3Ni2O7, transverse orbital fluctuations peak at (π/2, π/2) and sit closer to divergence than longitudinal ones, pointing to a possible orbital-fluctuation mechanism.

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