Interdependent scaling of long-range oxygen and magnetic ordering in non-stoichiometric Nd${}_2$NiO${}_{4.10}$

Sumit Ranjan Maity; Monica Ceretti; Lukas Keller; Jürg Schefer; Martin Meven; Ekaterina Pomjakushina; Werner Paulus

doi:10.1103/PhysRevMaterials.5.014401

paper

Interdependent scaling of long-range oxygen and magnetic ordering in non-stoichiometric Nd $_{2}$ NiO $_{4.10}$

arXiv:2101.04641 · doi:10.1103/PhysRevMaterials.5.014401

Abstract

Hole doping in Nd $_{2}$ NiO $_{4.00}$ can be either achieved by substituting the trivalent Nd atoms by bivalent alkaline earth metals or by oxygen doping, yielding Nd $_{2}$ NiO $_{4 + δ}$ . In this study, we investigated the interplay between oxygen and spin ordering for a low oxygen doping concentration i.e. Nd $_{2}$ NiO $_{4.10}$ . Although the extra oxygen doping level remains rather modest with only one out of 20 possible interstitial tetrahedral lattice sites occupied, we observed by single crystal neutron diffraction the presence of a complex 3D modulated structure related to oxygen ordering already at ambient, the modulation vectors being $\pm$ 2/13\textit{\textbf{a*}} $\pm$ 3/13\textit{\textbf{b*}}, $\pm$ 3/13\textit{\textbf{b*}} $\pm$ 2/13\textit{\textbf{b*}} and $\pm$ 1/5\textit{\textbf{a*}} $\pm$ 1/2\textit{\textbf{c*}} and satellite reflections up to fourth order. Temperature dependent neutron diffraction studies indicate the coexistence of oxygen and magnetic ordering below T $_{N}$ $≃$ 48 K, the wave vector of the Ni sublattice being \textbf{\textit{k}}=(100). In addition, magnetic satellite reflections adapt exactly the same modulation vectors as found for the oxygen ordering, evidencing a unique coexistence of 3D modulated ordering for spin and oxygen ordering in Nd $_{2}$ NiO $_{4.10}$ . Temperature dependent measurements of magnetic intensities suggest two magnetic phase transitions below 48 K and 20 K, indicating two distinct onsets of magnetic ordering for the Ni and Nd sublattice, respectively.

arXiv comment9 pages, 5 figures, supplemetary material linked in the paper

Interdependent scaling of long-range oxygen and magnetic ordering in non-stoichiometric Nd2​NiO4.10​

Abstract

References in corpus (8)

Interdependent scaling of long-range oxygen and magnetic ordering in non-stoichiometric Nd $_{2}$ NiO $_{4.10}$