Magnetic structure and excitations in long-range oxygen ordered Pr2NiO4.25
We want to compare magnetic ordering and excitations in oxygen doped Pr2NiO4.25 with the isoelectronic Pr1.5Sr0.5NiO4 phase. The oxygen doped phase shows translational periodicities of more than 100 Å, while Pr1.5Sr0.5NiO4 adopts the 5.5 x 5.5 x 12.4 Å3 K2NiF4 type unit cell. While the magnetic ordering is essentially 2D for Sr-doped phases, O-doping results into a significantly stronger coupling along the c-axis, related to the presence of interstitial oxygen, which is supposed to be part of the magnetic exchange pathway. The stronger magnetic exchange interactions in case of O-doping is also indicated by a doubling of the c-axis below 100K, while remaining invariant for the Sr-doped phase. We focus to explore dispersions perpendicular to the 2D layers, i.e. along [001], which has been essentially neglected so far. We want to study the hierarchy of different degrees of freedom as oxygen together with electronic ordering phenomena, i.e. magnetic and charge ordering
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PAULUS Werner; CERETTI Monica; MEVEN Martin; PIOVANO Andrea; SCHMIDT Wolfgang F and ZENI CUNHA Laura. (2023). Magnetic structure and excitations in long-range oxygen ordered Pr2NiO4.25. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.CRG-3006
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