OpenAccess

We report a comprehensive investigation of the excitation spectrum of ErFeO$_3$ orthoferrite by means of time-of-flight neutron spectroscopy. The spectrum consists of two distinct components: strongly dispersive spin wave excitations of the Fe$^{3+}$ sublattice spanning ≈9 – 65 meV, and crystal electric field (CEF) excitations of Er$^{3+}$ ions below 36 meV. [...]

We investigate lattice dynamics in LaCoO$_3$ using inelastic neutron and x-ray scattering over T=2 − 6⁢5⁢0  K, spanning the spin-state crossover at T$_1$ ≈ 1⁢0⁢0  K and the insulator-metal transition at T$_2$ ≈ 5⁢5⁢0  K. Comparison with quasiharmonic ab initio lattice-dynamical calculations helps reveal anomalous softening of a ≈ 1⁢0−meV oxygen phonon, confined to the temperature interval T$_1$ ≤ T ≤ T$_2$ and localized in momentum space at 𝐪$_{SSO}$ = (½,½,½)$_c$. [...]

Resonant neutron reflectometry is a powerful probe of hydrogen absorption in thin layers, offering high depthsensitivity and low measurement time. In the case of a hydrogen barrier layer which hinders diffusion theconcentration gradient modifies the resonance conditions in the reflectometric measurement [...]

A topical exchange entitled “Future Trends in Neutron Science – User Needs and Community Collaboration” was jointly organized by the Asia-Oceania Neutron Scattering Association (AONSA), the Neutron Scattering Society of America (NSSA), and the European Neutron Scattering Association (ENSA) during the International Conference on Neutron Scattering (ICNS) 2025 [Citation1]. The conference took place from 6 to 10 July 2025 in Copenhagen (Denmark) and Lund (Sweden), and the session was held on Wednesday, 9 July 2025, as one of the parallel afternoon sessions.The objective of the exchange was to (i) identify new scientific trends in neutron science and the experimental needs that will arise from them and (ii) translate community perspectives into actionable recommendations for user groups, neutron facilities, funding bodies, and policymakers. [...]

A Lipschitz continuous function f that has a high-precision, albeit slow reference implementation can beevaluated more rapidly by piecewise polynomials, obtained by Chebyshev approximation. The partition intosubdomains should be made such that the computation of subdomain index and reduced function argument isfast and introduces no rounding errors. [...]