Charge-stripe order, antiferromagnetism, and spin dynamics in the cuprate-analog nickelate La4Ni3O8
O. O. Bernal, D. E. MacLaughlin, G. D. Morris, P.-C. Ho, Lei Shu, C. Tan, J. Zhang, Z. Ding, K. Huang, V. V. Poltavets
DOI 10.1103/PhysRevB.100.125142 · Physical Review B
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Abstract
We report results of a muon spin rotation (μSR) study of the cuprate-analog nickelate La4Ni3O8, which undergoes a transition at 105 K to a low-temperature phase with charge-stripe and antiferromagnetic (AFM) order on square planar NiO2 layers. Zero-field μSR shows that the AFM transition is abrupt, commensurate, and has a quasi-two-dimensional character below ∼25 K. Comparison of observed muon precession frequencies with Ni dipolar field calculations yields Ni moments ≲0.5μB. Dynamic muon spin relaxation above 105 K suggests critical slowing of Ni spin fluctuations, but is inconsistent with corresponding La139 NMR results. Critical slowing and an abrupt transition are also observed in the planar cuprate AFM La2CuO4+δ, where they are taken as evidence for weakly interplanar-coupled two-dimensional AFM spin fluctuations, but our μSR data do not agree quantitatively with theoretical predictions for this scenario when applied to the nickelate.
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