Magnetic phase diagram of theS= 1/2 triangular layered compound NaNiO₂: a single crystal study

Abstract

Using magnetic torque measurements on a NaNiO(2) single crystal, we have established the magnetic phase diagram of this triangular compound. It presents five different phases depending on the temperature (4-300 K) and magnetic field (0-22 T) revealing several spin reorientations coupled to different magnetic anisotropies.

The effect of octahedral distortions on the electronic properties and magnetic interactions in O3 NaTMO2 compounds (TM = Ti–Ni & Zr–Pd)

“…states of adjacent TMO 2 layers, p-d kinetic exchange is not expected to result in signicant intra-plane coupling. Among all compounds only NaMnO 2 , NaNiO 2 and NaTcO 2 had small positive DE AAFM values indicating weak ferromagnetic intraplane coupling resulting in T C values lower than $50 K. This prediction, particularly for the NaNiO 2 compound, is agreement with the earlier observation that measured a T C of $20 K 7. In the case of NaNbO 2 , NaPdO 2 and NaCoO 2 compounds, the negative DE AAFM values along with positive DE CAFM values predict A-type antiferromagnetic ground state.…”

“…For instance, reports of conicting experimental observations of the magnetic properties for the same compound is not unheard of. 6,7 Such contradictions oentimes stem from coarse structural characterization, restricted by instruments' range and resolution, which falls short in capturing the delicate structural details that dictate the magnetic ground state in these compounds. 8,9 This study therefore presents a detailed and focused density functional insight into one important family of such layered materials, namely O3 NaTMO 2 compounds in which TM is a fourth or h row transition metal element.…”

Unique Structure-Induced Magnetic and Electrochemical Activity in Nanostructured Transition Metal Tellurates Co1 – xNixTeO4 (x = 0, 0.5, and 1)

“…23 For instance, contradictory observations of the magnetic properties for the same compound (NaNiO 2 ) are not exceptional. 51,52 Such contradictions stem from the coarse structural characterization, which can be restricted mainly by the resolution of the instruments. Limitations in the measurements can fail to capture the fine structural details that explain the magnetic ground state in the compounds.…”

High pO2 Flux Growth and Characterization of NdNiO3 Crystals

“…We noticed that the mixture of NaOH/KOH (molar ratio 1:1) has a low melting point of ~170 • C, which could possibly lower the growth temperature of NdNiO 3 significantly and reduce defects in the as-grown crystals. In addition, we found that single crystals of YBa 2 Cu 4 O 8 and NaNiO 2 were successfully grown by Song et al [36] and Brion et al [37], respectively, using such a hydroxide flux system. Initially, we attempted to grow NdNiO 3 at pO 2 = 20 bar at 400 • C. Black powders with tiny shiny crystals of ~10 µm were obtained.…”