Anomalous Hall effect from inter-superlattice scattering in a noncollinear antiferromagnet.

Superlattice formation dictates the physical properties of many materials, including the nature of the ground state in magnetic materials. Chemical composition is commonly considered to be the primary determinant of superlattice identity, especially in intercalation compounds. Nevertheless, in this work, we find that kinetic control of superlattice growth leads to the coexistence of disparate crystallographic domains within a compositionally perfect single crystal.

Spin density wave and van Hove singularity in the kagome metal CeTiBi.

Kagome metals with van Hove singularities near the Fermi level can host intriguing quantum phenomena such as chiral loop currents, electronic nematicity, and unconventional superconductivity. However, to our best knowledge, unconventional magnetic states driven by van Hove singularities-like spin-density waves-have not been observed experimentally in kagome metals. Here, we report the magnetic and electronic structure of the layered kagome metal CeTiBi, where Ti kagome electronic structure interacts with a magnetic sublattice of Ce J = 1/2 moments.

Spin Waves in Dirac Semimetal Ca_{0.6}Sr_{0.4}MnSb_{2} Investigated with Neutrons by the Diffraction Method.

The tunability of Dirac semimetals with antiferromagnetic Mn layers is of great interest. The observed sign change of interlayer magnetic coupling between CaMnBi_{2} and SrMnBi_{2} suggests ionic substitution as a potential tuning mechanism. If so, novel behavior near the compensation point could be expected.

Mechanical Activation and Cation Site Disorder in MgAlO.

The synthesis and crystallographic site occupancy were investigated for MgAlO with and without mechanical activation of the precursor powders. Heating to 1200 °C or higher resulted in the formation of a single spinel phase regardless of whether the powders were mechanically activated or not. Neutron diffraction analysis was used to determine cation site occupancy and revealed that mechanical activation resulted in a lower degree of cation site inversion compared to the nonactivated materials, which indicated that the powders were closer to thermodynamic equilibrium.

Quantifying fish otolith mineralogy for trace-element chemistry studies.

Otoliths are frequently used to infer environmental conditions or fish life history events based on trace-element concentrations. However, otoliths can be comprised of any one or combination of the three most common polymorphs of calcium carbonate-aragonite, calcite, and vaterite-which can affect the ecological interpretation of otolith trace-element results. Previous studies have reported heterogeneous calcium carbonate compositions between left and right otoliths but did not provide quantitative assessments of polymorph abundances.

Domain Wall Patterning and Giant Response Functions in Ferrimagnetic Spinels.

The manipulation of mesoscale domain wall phenomena has emerged as a powerful strategy for designing ferroelectric responses in functional devices, but its full potential is not yet realized in the field of magnetism. This work shows a direct connection between magnetic response functions in mechanically strained samples of Mn O and MnV O and stripe-like patternings of the bulk magnetization which appear below known magnetostructural transitions. Building off previous magnetic force microscopy data, a small-angle neutron scattering is used to show that these patterns represent distinctive magnetic phenomena which extend throughout the bulk of two separate materials, and further are controllable via applied magnetic field and mechanical stress.