First time determination of the microscopic structure of a stripe phase: Low temperature NMR in La2NiO4.17

Abstract

The experimental observations of stripes in superconducting cuprates and insulating nickelates clearly show the modulation in charge and spin density. However, these have proven to be rather insensitive to the harmonic structure and (site or bond) ordering. Using 139La NMR in La2NiO4.17, we show that in the 1/3 hole doped nickelate below the freezing temperature the stripes are strongly solitonic and site ordered with Ni3+ ions carrying S=1/2 in the domain walls and Ni2+ ions with S=1 in the domains.

4 pages including 4 figures

Cited by in corpus (7)

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• Electronic structure of superoxygenated La2NiO4 domains with ordered oxygen interstitials
• NMR evidence for two-step phase-separation in Nd_{1.85}Ce_{0.15}CuO_{4-delta}
• Stability of charge-stripe ordered La2-xSrxNiO4+delta at one third doping
• VUV Pump and probe of phase separation and oxygen interstitials in La2NiO4+y using spectromicroscopy