G. E. Granroth
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View article: Sample changers for direct geometry neutron chopper spectrometers
Sample changers for direct geometry neutron chopper spectrometers Open
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 th…
View article: Unraveling the Nature of Vibrational Dynamics in CsPbI<sub>3</sub> by Inelastic Neutron Scattering and Molecular Dynamics Simulations
Unraveling the Nature of Vibrational Dynamics in CsPbI<sub>3</sub> by Inelastic Neutron Scattering and Molecular Dynamics Simulations Open
Cesium lead iodide, CsPbI3, is an optoelectronic material of large interest for various technological applications; however, fundamental questions surrounding the vibrational dynamics of this material, especially regarding its r…
View article: Resolving the dynamic correlated disorder in KTa <sub> 1− <i>x</i> </sub> Nb <sub> <i>x</i> </sub> O <sub>3</sub>
Resolving the dynamic correlated disorder in KTa <sub> 1− <i>x</i> </sub> Nb <sub> <i>x</i> </sub> O <sub>3</sub> Open
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-cente…
View article: Impact of structural coherence and disorder on the ionic transport and lattice dynamics in Li <sup>+</sup> -conducting argyrodites
Impact of structural coherence and disorder on the ionic transport and lattice dynamics in Li <sup>+</sup> -conducting argyrodites Open
While thermal conductivity is almost unaffected by post-synthesis treatments of lithium argyrodites, reducing coherence length and crystallite size, it is changed significantly by structural disordering suppressing phonon gas-type thermal …
View article: Phonon Dispersion Relations and Electron-Phonon Coupling in Iridium
Phonon Dispersion Relations and Electron-Phonon Coupling in Iridium Open
This dataset comprises inelastic neutron scattering measurements of iridium conducted at SNS (ARCS, ITPS-30061) and HFIR (HB-3, TAX, IPTS-25194). ARCS data collected using 50 meV incident energy and include both signal and background files…
View article: ARCS White Beam Vanadium Normalization Data for SNS Cycle 2022B
ARCS White Beam Vanadium Normalization Data for SNS Cycle 2022B Open
Neutron scattering Data from a Vanadium cylinder. Acquired on the ARCS spectrometer in white beam mode to normalize the detector efficiencies. During Cycle 2022B
View article: Nanoscale structural correlations in a model cuprate superconductor
Nanoscale structural correlations in a model cuprate superconductor Open
Understanding the extent and role of inhomogeneity is a pivotal challenge in the physics of cuprate superconductors. While it is known that structural and electronic inhomogeneity is prevalent in the cuprates, it has proven difficult to di…
View article: Atomistic origin of the entropy of melting from inelastic neutron scattering and machine learned molecular dynamics
Atomistic origin of the entropy of melting from inelastic neutron scattering and machine learned molecular dynamics Open
The latent heat, L, is central to melting, but its atomic origin remains elusive. It is proportional to the entropy of fusion, ΔSfus = L/Tm (Tm is the melting temperature), which depends on changes of atom …
View article: Spin-Charge-Lattice Coupling across the Charge Density Wave Transition in a Kagome Lattice Antiferromagnet
Spin-Charge-Lattice Coupling across the Charge Density Wave Transition in a Kagome Lattice Antiferromagnet Open
Understanding spin and lattice excitations in a metallic magnetic ordered system forms the basis to unveil the magnetic and lattice exchange couplings and their interactions with itinerant electrons. Kagome lattice antiferromagnet FeGe is …
View article: Magnon gap tuning in lithium-doped MnTe
Magnon gap tuning in lithium-doped MnTe Open
Manganese telluride (MnTe) is a prospective platform for ultrafast carrier dynamics, spin-based thermoelectrics, and magnon-drag transport due to its unique electronic and magnetic properties. We use inelastic neutron scattering to study b…
View article: Monte–Carlo ray-tracing studies of multiplexed prismatic graphite analyzers for the cold-neutron triple-axis spectrometer at the High Flux Isotope Reactor
Monte–Carlo ray-tracing studies of multiplexed prismatic graphite analyzers for the cold-neutron triple-axis spectrometer at the High Flux Isotope Reactor Open
View article: Nanoscale structural correlations in a model cuprate superconductor
Nanoscale structural correlations in a model cuprate superconductor Open
Understanding the extent and role of inhomogeneity is a pivotal challenge in the physics of cuprate superconductors. While it is known that structural and electronic inhomogeneity is prevalent in the cuprates, it has proven difficult to di…
View article: Incident beamline design for a modern cold triple axis spectrometer at the High Flux Isotope Reactor
Incident beamline design for a modern cold triple axis spectrometer at the High Flux Isotope Reactor Open
View article: Thermal evolution of spin excitations in honeycomb Ising antiferromagnetic FePSe3
Thermal evolution of spin excitations in honeycomb Ising antiferromagnetic FePSe3 Open
We use elastic and inelastic neutron scattering (INS) to study the antiferromagnetic (AF) phase transitions and spin excitations in the two-dimensional (2D) zig-zag antiferromagnet FePSe 3 . By determining the magnetic order parameter acro…
View article: Spin-charge-lattice coupling across the charge density wave transition in a Kagome lattice antiferromagnet
Spin-charge-lattice coupling across the charge density wave transition in a Kagome lattice antiferromagnet Open
Understanding spin and lattice excitations in a metallic magnetic ordered system form the basis to unveil the magnetic and lattice exchange couplings and their interactions with itinerant electrons. Kagome lattice antiferromagnet FeGe is i…
View article: Competing itinerant and local spin interactions in kagome metal FeGe
Competing itinerant and local spin interactions in kagome metal FeGe Open
View article: Thermal evolution of spin excitations in honeycomb Ising antiferromagnetic FePSe3
Thermal evolution of spin excitations in honeycomb Ising antiferromagnetic FePSe3 Open
We use elastic and inelastic neutron scattering (INS) to study the antiferromagnetic (AF) phase transitions and spin excitations in the two-dimensional (2D) zig-zag antiferromagnet FePSe$_3$. By determining the magnetic order parameter acr…
View article: Advanced manufacturing of 3D custom boron-carbide collimators designed for complex environments for neutron scattering
Advanced manufacturing of 3D custom boron-carbide collimators designed for complex environments for neutron scattering Open
View article: ARCS White Beam Vanadium Normalization for SNS Cycle 2020A
ARCS White Beam Vanadium Normalization for SNS Cycle 2020A Open
This is a white beam data set from V to normalize the relative detector performance. See the ARCS_155050.md file for more information
View article: ZrH2 as measured on ARCS for NXS2021
ZrH2 as measured on ARCS for NXS2021 Open
This data is for ZrH2 in an Al can it is measured at room temperature. This data was used for the Neutron and Xray scattering school in 2021. It was measured on the ARCS direct geometry spectrometer at the spallation neutron source. The .n…
View article: ARCS White Beam Vanadium Normalization for SNS Cycle 2021B
ARCS White Beam Vanadium Normalization for SNS Cycle 2021B Open
This is a white beam data set from V to normalize the relative detector performance. See the ARCS_201562.md file for more information
View article: Monte-Carlo ray-tracing studies of multiplexed prismatic graphite analyzers for the cold-neutron triple-axis spectrometer at the High Flux Isotope Reactor
Monte-Carlo ray-tracing studies of multiplexed prismatic graphite analyzers for the cold-neutron triple-axis spectrometer at the High Flux Isotope Reactor Open
A modern cold triple-axis spectrometer to study quantum condensed matter systems is planned for the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory. Here, we describe the conceptual principles and design of a secondary sp…
View article: Inelastic Neutron Scattering Study of Phonon Density of States of Iodine Oxides and First-Principles Calculations
Inelastic Neutron Scattering Study of Phonon Density of States of Iodine Oxides and First-Principles Calculations Open
Iodine oxides I2Oy (y = 4, 5, 6) crystallize into atypical structures that fall between molecular- and framework-base types and exhibit high reactivity in an ambient environment, a property highly desire…
View article: Additive manufacturing of composite neutron absorbing components
Additive manufacturing of composite neutron absorbing components Open
Collimators and other components for use in neutron scattering experiments or to provide neutron shielding in nuclear reactors or accelerator based neutron sources are produced by additive manufacturing from multiple different types of mat…
View article: Diffuse Inelastic Neutron Scattering from Anharmonic Vibrations in Cuprite
Diffuse Inelastic Neutron Scattering from Anharmonic Vibrations in Cuprite Open
Atomic vibrational dynamics in cuprite, Cu2O, was studied by inelastic neutron scattering and molecular dynamics (MD) simulations from 10 K to 900 K. Above 300 K, a diffuse inelastic intensity (DII) appeared, obscuring the high-energy phon…
View article: Spin wave Hamiltonian and anomalous scattering in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>NiPS</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>
Spin wave Hamiltonian and anomalous scattering in Open
Here, we report a comprehensive spin wave analysis of the semiconducting honeycomb van der Waal antiferromagnet NiPS3. Using single-crystal inelastic neutron scattering, we map out the full Brillouin zone and fit the observed mo…
View article: Neutron imaging software tools at the Oak Ridge National Laboratory
Neutron imaging software tools at the Oak Ridge National Laboratory Open
Over the past decade, Oak Ridge National Laboratory developed neutron capabilities at both the High Flux Isotope Reactor and the Spallation Neutron Source. A broad scientific portfolio has flourished at both facilities such that a new faci…
View article: Identifying and Constructing Complex Magnon Band Topology
Identifying and Constructing Complex Magnon Band Topology Open
Magnetically ordered materials tend to support bands of coherent propagating spin wave, or magnon, excitations. Topologically protected surface states of magnons offer a new path towards coherent spin transport for spintronics applications…
View article: Zero-point motion of liquid and solid hydrogen
Zero-point motion of liquid and solid hydrogen Open
We present an inelastic neutron scattering study of liquid and solid hydrogen carried out using the wide Angular Range Chopper Spectrometer at Oak Ridge National Laboratory. From the observed dynamic structure factor, we obtained empirical…
View article: Magnetism and charge density wave order in kagome FeGe
Magnetism and charge density wave order in kagome FeGe Open