The emergence of the infinite-layer superconducting nickelate thin films marks the Ni age of
superconductivity, which has excited a huge surge of studies since the first report in August …

In the past decade intense research activity in the area of the so-called Ruddlesden-Poper
phases, especially the nickelates, has been motivated by the similarity of their structure and …

Structural, transport, and magnetic data for the system La 2− x Sr x NiO 4, 0≤ x≤ 1.6, are
reported. The oxygen content of the system was controlled by annealing under various …

Nonstoichiometric phases of the compound La 2 NiO 4 have been synthesized and
chemically characterized. Their defect chemistry involves interstitial oxygens, oxygen …

For the first time a triple-layer T′-type arrangement has been stabilized in mixed-valence Ni
1+ Ni 2+ nickelates R 4 Ni 3 O 8 (R= La, Pr, Nd). These compounds are obtained by …

With an objective to understand the influence of the size of the A cations, the crystal
chemistry and electrical properties of La2− xAxNiO4 (A= Ca, Sr, and Ba) are compared. The …

Various criteria of formation of perovskites and K 2 NiF 4-type compounds, which are the
end members of homologous Ruddlesden-Popper series of phases, have been discussed …

Solid-solutions of the type Nd 2− x Sr x NiO 4+ δ (0≤ x≤ 1) were prepared by
codecomposition of the metal nitrates and were characterized by means of powder X-ray …

Polarization-dependent near-edge x-ray absorption spectroscopy measurements have been
performed on the O 1s and Ni 2p edges of La 2− x Sr x NiO 4+ δ single crystals for 0≤ x≤ …

Neutron powder diffraction and magnetization measurements have been performed in
stoichiometric Pr 2 NiO 4+ δ (δ≈ 0), which at room temperature (RT) is orthorhombic …