A5067751608- Advanced Condensed Matter Physics
- Multiferroics and related materials
- Magnetic and transport properties of perovskites and related materials
- Physics of Superconductivity and Magnetism
- Theoretical and Computational Physics
- Crystal Structures and Properties
- Inorganic Fluorides and Related Compounds
- Perovskite Materials and Applications
- Literature, Language, and Rhetoric Studies
University of Toronto
2022-2024
$\ensuremath{\alpha}$-RuCl${}_{3}$ is a candidate for realizing the Kitaev quantum spin liquid state. Despite extensive research efforts, its crystal structure at temperatures relevant to studying physics has been controversial. Here, authors examine single with minimal twinning and stacking faults, allowing them unambiguously determine symmetry change across structural phase transition. They find that three-fold rotational of honeycomb plane restored in low-temperature group...
Abstract We report x-ray diffraction and resonant elastic scattering (REXS) studies on two α-RuCl3 crystals with distinct magnetic transition temperatures: TN =7.3K 6.5K. find that the sample =6.5K exhibits a high degree of stacking faults structural twinning at low temperature, whereas primarily comprises single domain R-3. Notwithstanding, both samples exhibit an identical zigzag structure, moments pointing away from honeycomb plane by α = 31(2)◦. argue ordered moment directions in these...
We report field-dependent high-resolution inelastic neutron scattering (INS) measurements on the honeycomb lattice magnet, ${\mathrm{CoTiO}}_{3}$, to study evolution of its magnon excitations across a spin reorientation transition driven by an in-plane magnetic field. By carrying out elastic in field, we show that sample transitions from collinear antiferromagnetic state with multiple domains at low field monodomain canted structure high Concurrent this transition, observed significant...
Abstract We report X-ray diffraction and resonant elastic scattering (REXS) studies on two α-RuCl3 crystals with distinct magnetic transition temperatures: TN=7.3K 6.5K. find that the sample TN=6.5K exhibits a high degree of structural twinning at low temperature, whereas primarily comprises single domain R¯3. Notwithstanding, both samples exhibit an identical zigzag structure, moments pointing away from honeycomb plane by α = 31(2)◦.We argue ordered moment directions in these suggest...
We report X-ray diffraction and resonant elastic scattering (REXS) studies on two $\alpha$-RuCl$_{3}$ crystals with distinct magnetic transition temperatures: T$_{N}$=7.3K 6.5K. find that the sample T$_{N}$=6.5K exhibits a high degree of structural twinning at low temperature, whereas primarily comprises single domain R$\bar{3}$. Notwithstanding, both samples exhibit an identical zigzag structure, moments pointing away from honeycomb plane by $\alpha=31(2)^{\circ}$. argue ordered moment...
We report field-dependent high-resolution inelastic neutron scattering (INS) measurements on the honeycomb lattice magnet, CoTiO$_3$, to study evolution of its magnon excitations across a spin reorientation transition driven by an in-plane magnetic field. By carrying out elastic in field, we show that sample transitions from collinear antiferromagnetic state with multiple domains at low field mono-domain canted structure high Concurrent this transition, observed significant changes both...
We carried out a comprehensive crystal structure characterization of Ti-doped lithium ruthenate (Li$_2$Ti$_x$Ru$_{1-x}$O$_3$), to investigate the effect Ti-doping on structural phase transition. Experimental tools sensitive average (X-ray diffraction), as well those local (Extended X-ray Absorption Fine Structure, EXAFS; pair distribution function, PDF) are used. observed non-monotonic dependence transition temperature level. At low doping, slightly increases with while at high decreases...
We report X-ray diffraction and magnetic susceptibility studies of the structural phase transition in $\alpha$-RuCl$_{3}$. By utilizing a single crystal sample with predominantly twin domain, we show that $\alpha$-RuCl$_{3}$ goes from high-temperature C2/m structure to rhombohedral R$\bar{3}$ symmetry at low temperature. While defining feature is changing stacking direction monoclinic a-axis b-axis, bond-anisotropy disappears when change occurs, indicating local $C_3$ restored within...
We report our study of cobalt (II) titanate, CoTiO3, in which magnetic Co ions are replaced by non-magnetic ions. The antiferromagnetic ordering transition CoTiO3around 37 K is described with ferromagnetic honeycomb layers coupled antiferromagnetically along the crystallographicc-direction. effect dilution on Néel temperature this material investigated through doping Zn2+and Mg2+in place Co2+for various levels up tox+y= 0.46 Co1-x-yZnxMgyTiO3. Single phase polycrystalline samples have been...