Sample changers for direct geometry neutron chopper spectrometers.

The advent of higher flux neutron sources has made the use of sample changers appropriate across the instrument suites at neutron scattering facilities. We examine the efficiency, design, and operation of two sample changers used at the thermal chopper spectrometers at the Spallation Neutron Source. We also present case studies of sample holders designed to accommodate multiple single crystal or powder samples for the Cold Neutron Chopper Spectrometer at the Spallation Neutron Source.

Anomalous Electrical Transport in the Kagome Magnet YbFe_{6}Ge_{6}.

Two-dimensional (2D) kagome metals offer a unique platform for exploring electron correlation phenomena derived from quantum many-body effects. Here, we report a combined study of electrical magnetotransport and neutron scattering on YbFe_{6}Ge_{6}, where the Fe moments in the 2D kagome layers exhibit an A-type collinear antiferromagnetic order below T_{N}≈500  K. Interactions between the Fe ions in the layers and the localized Yb magnetic ions in between reorient the c-axis-aligned Fe moments to the kagome plane below T_{SR}≈63  K.

Engineering gene drive docking sites in a haplolethal locus in .

Gene drives are selfish genetic elements which promise to be powerful tools in the fight against vector-borne diseases such as malaria. We previously proposed population replacement gene drives designed to better withstand the evolution of resistance by homing through haplolethal loci. Because most mutations in the wild-type allele that would otherwise confer resistance are lethal, only successful drive homing permits the cell to survive.

Resolving the dynamic correlated disorder in KTaNbO.

Understanding the complex temporal and spatial correlations of ions in disordered perovskite oxides is critical to rationalize their functional properties. Here, we provide insights into the longstanding controversy regarding the off-centering of transition metal (TM) ions in the archetypal ferroelectric alloy KTa[Formula: see text]Nb[Formula: see text]O[Formula: see text] (KTN). By mapping the full energy ([Formula: see text]) and wavevector ([Formula: see text]) dependence of the dynamical structure factor [Formula: see text] using neutron scattering, and rationalizing our observations with atomistic simulations leveraging machine learning, we fully resolve the static s dynamic nature of diffuse scattering sheets, as well as their composition ([Formula: see text]) and temperature dependence.

Comment on 'Resonant inelastic x-ray scattering from UOand UN'.

In a recent manuscript, Lawrence Bright(2023175501) reported the resonant inelastic x-ray scattering spectra of UO, as well as UN. Their goal was to identify electronic multiplets associated with a 5configuration with ground state2F5/2. Complete active space self-consistent field with spin-orbit coupling (CASSCF-SOC) predicted that2F5/2transitions should be observable at 190 and 328 meV.