Resilience of the Aurivillius structure upon La and Cr doping in a BiTiFeO multiferroic.

Combining the experimental techniques of high-resolution X-ray diffraction, magnetometry, specific heat measurement, and X-ray photoelectron, Raman and dielectric spectroscopy techniques, we have studied the influence of La and Cr doping on the crystal structure and magnetism of the room temperature Aurivillius multiferroic BiTiFeO by investigating the physical properties of (BiLa)TiFeO and BiTi (FeCr)O. The parent (BiTiFeO) and the doped ((BiLa)TiFeO and BiTi(FeCr)O) compounds crystallize in the 2 space group, which is confirmed through our analysis of high-resolution synchrotron X-ray diffraction data obtained on phase-pure polycrystalline powders. We determined the oxidation states of the metal atoms in the studied compounds as Fe, Ti, Cr, and La through the analysis of X-ray photoelectron spectroscopy data.

Magnetic structures and excitations in sawtooth olivine chalcogenides MnSiX (X = S, Se).

The Mn lattice in olivine chalcogenide MnSiX (X = S, Se) compounds forms a sawtooth, which is of special interest in magnetism owing to the possibility of realizing flat bands in magnon spectra, a key component in magnonics. In this work, we investigate the MnSiX olivines using magnetic susceptibility, and X-ray and neutron diffraction. We have determined the average and local crystal structures of MnSiS and MnSiSe using synchrotron X-ray, neutron diffraction, and X-ray total scattering data followed by Rietveld and pair distribution function analyses.

Absence of long-range magnetic order in lithium-containing honeycombs in the Li-Cr-Sb(Te)-O phases.

Li((LiCr)(Te/Sb))Ocompounds where Cr atoms along with Li and Te or Sb are part of a honeycomb and are studied using magnetic susceptibility, specific heat, x-ray photoelectron spectroscopy and neutron diffraction. The oxides stoichiometries as determined from the neutron diffraction studies are LiCrTeOand LiCrSbOwith a stable oxidation state of +3 for Cr. Both the compounds crystallize in space group2/with intermixing of cations at the 4sites leaving the 2sites preferentially for Te or Sb.