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View article: About the Cases in Which the Formula x^4+mxxyy+y^4 Can be Reduced to a Square
About the Cases in Which the Formula x^4+mxxyy+y^4 Can be Reduced to a Square Open
Euler continues a previous study on the title Quartic (E696) with a new approach. His starting point here is the observation that, when the title Quartic is solved for m, the resulting fraction becomes an integer when z=ax^2y^2-(x^2±y^2). …
View article: Report on the"Workshop on Scientific Benefits andApplications of Resonant Spin Echo"
Report on the"Workshop on Scientific Benefits andApplications of Resonant Spin Echo" Open
An international group of scientists gathered for the “Workshop on Scientific Benefits and Applications of Resonant Spin Echo” at Oak Ridge National Laboratory (ORNL) on February 13-15, 2024. The workshop community shared strong enthusiasm…
View article: On the Cases in Which the Formula x^4+kxxyy+y^4 Can Be Reduced to a Square
On the Cases in Which the Formula x^4+kxxyy+y^4 Can Be Reduced to a Square Open
Euler’s key idea for equating the Quartic in the title to a square is to set k=P+surd(Q). From this he derives P=f·x^2 and Q=4f·y^2+4 and solves the Pell equation for y. He then discusses various extensions to rational numbers that leave k…
View article: Static and dynamical properties of the spin-5/2 nearly ideal triangular lattice antiferromagnet Ba3MnSb2O9
Static and dynamical properties of the spin-5/2 nearly ideal triangular lattice antiferromagnet Ba3MnSb2O9 Open
We study the ground state and spin excitations in Ba3MnSb2O9, an easy-plane S = 5/2 triangular lattice antiferromagnet. By combining single-crystal neutron scattering, electric spin resonance (ESR), and spin wave calculations, we determine…
View article: Modern Trends in Neutron Scattering Instrument Technologies
Modern Trends in Neutron Scattering Instrument Technologies Open
This article reviews some current trends that can be observed in the development of neutron scattering instrument technologies. While the number of neutron scattering facilities worldwide and the number of beam days they offer are largely …
View article: EXPANSE: A time-of-flight EXPanded Angle Neutron Spin Echo spectrometer at the Second Target Station of the Spallation Neutron Source
EXPANSE: A time-of-flight EXPanded Angle Neutron Spin Echo spectrometer at the Second Target Station of the Spallation Neutron Source Open
EXPANSE, an EXPanded Angle Neutron Spin Echo instrument, has been proposed and selected as one of the first suite of instruments to be built at the Second Target Station of the Spallation Neutron Source at the Oak Ridge National Laboratory…
View article: Strongly Anharmonic Phonons and Their Role in Superionic Diffusion and Ultralow Thermal Conductivity of Cu<sub>7</sub>PSe<sub>6</sub>
Strongly Anharmonic Phonons and Their Role in Superionic Diffusion and Ultralow Thermal Conductivity of Cu<sub>7</sub>PSe<sub>6</sub> Open
The quest for advanced superionic materials requires understanding their complex atomic dynamics, but detailed studies of the interplay between lattice vibrations and ionic diffusion remain scarce. Here inelastic and quasielastic neutron s…
View article: Topological magnon band structure of emergent Landau levels in a skyrmion lattice
Topological magnon band structure of emergent Landau levels in a skyrmion lattice Open
The motion of a spin excitation across topologically nontrivial magnetic order exhibits a deflection that is analogous to the effect of the Lorentz force on an electrically charged particle in an orbital magnetic field. We used polarized i…
View article: Modulation of intensity emerging from zero effort (MIEZE) with extended Fourier time at large scattering angle
Modulation of intensity emerging from zero effort (MIEZE) with extended Fourier time at large scattering angle Open
Modulation of Intensity Emerging from Zero Effort (MIEZE) is a neutron resonant spin echo technique that allows one to measure time correlation scattering functions in materials by implementing radio-frequency (RF) intensity modulation at …
View article: Data supplement for "Topological magnon band structure of emergent Landau levels in a skyrmion lattice"
Data supplement for "Topological magnon band structure of emergent Landau levels in a skyrmion lattice" Open
Collection of the data sets for our paper, Topological magnon band structure of emergent Landau levels in a skyrmion lattice. (The source code supplement can be found here.) Contents Data files used for the paper's figures. Scan Figure Fil…
View article: Data supplement for "Topological magnon band structure of emergent Landau levels in a skyrmion lattice"
Data supplement for "Topological magnon band structure of emergent Landau levels in a skyrmion lattice" Open
Collection of the data sets for our paper, Topological magnon band structure of emergent Landau levels in a skyrmion lattice. (The source code supplement can be found here.) Contents Data files used for the paper's figures. Scan Figure Fil…
View article: Spin dynamics in the skyrmion-host lacunar spinel GaV4S8
Spin dynamics in the skyrmion-host lacunar spinel GaV4S8 Open
In the lacunar spinel GaV4S8, the interplay of spin, charge, and orbital degrees of freedom produces a rich phase diagram that includes an unusual Neel-type skyrmion phase composed of molecular spins. To provide insight into the interactio…
View article: Hierarchical excitations from correlated spin tetrahedra on the breathing pyrochlore lattice
Hierarchical excitations from correlated spin tetrahedra on the breathing pyrochlore lattice Open
The hierarchy of the coupling strengths in a physical system often engenders an effective model at low energies where the decoupled high-energy modes are integrated out. Here, using neutron scattering, we show that the spin excitations in …
View article: Magnetic Diffuse Scattering of YBaCo<sub>4</sub>O<sub>7</sub> and LuBaCo<sub>4</sub>O<sub>7</sub> on Kagome and Triangular Lattices
Magnetic Diffuse Scattering of YBaCo<sub>4</sub>O<sub>7</sub> and LuBaCo<sub>4</sub>O<sub>7</sub> on Kagome and Triangular Lattices Open
In this work, the magnetic diffuse scattering of YBaCo4O7 and LuBaCo4O7 with alternating kagome and triangular lattices has been studied through neutron scattering measurements on single-crystal samples. In YBaCo4O7, the line-shape-magneti…
View article: Large Angle MIEZE with Extended Fourier Time
Large Angle MIEZE with Extended Fourier Time Open
Modulation of Intensity Emerging from Zero Effort (MIEZE) is a neutron resonant spin echo technique which allows one to measure time correlation scattering functions in materials by implementing radio-frequency (RF) intensity modulation at…
View article: Emergent magnetic behavior in the frustrated Yb<sub>3</sub>Ga<sub>5</sub>O<sub>12</sub> garnet
Emergent magnetic behavior in the frustrated Yb<sub>3</sub>Ga<sub>5</sub>O<sub>12</sub> garnet Open
We report neutron scattering, magnetic susceptibility and Monte Carlo theoretical analysis to verify the shortrange nature of the magnetic structure and spin-spin correlations in a Yb3Ga5O12 single crystal. The quantum spin state of Yb3+ i…
View article: Nature of Partial Magnetic Order in the Frustrated Antiferromagnet Gd2Ti2O7
Nature of Partial Magnetic Order in the Frustrated Antiferromagnet Gd2Ti2O7 Open
Partially-ordered magnets are distinct from both spin liquids and conventional ordered magnets because order and disorder coexist in the same magnetic phase. Here, we determine the nature of partial order in the canonical frustrated pyroch…
View article: A Replacement Cold Neutron Guide System for HFIR (Conceptual Design Report)
A Replacement Cold Neutron Guide System for HFIR (Conceptual Design Report) Open
The design of a replacement cold neutron guide system for the High Flux Isotope Reactor (HFIR) is presented. The proposed six-channel design uses the latest technologies and is optimally designed to account for operational and site constra…
View article: Neutron xyz-polarization analysis at a time-of-flight instrument
Neutron xyz-polarization analysis at a time-of-flight instrument Open
When implementing a dedicated polarization analysis setup at a neutron time-of-flight instrument with a large area detector, one faces enormous challenges. Nevertheless, significant progress has been made towards this goal over the last fe…
View article: Van Hove singularity in the magnon spectrum of the antiferromagnetic quantum honeycomb lattice
Van Hove singularity in the magnon spectrum of the antiferromagnetic quantum honeycomb lattice Open
The magnetic excitation spectrum of the quantum magnet YbCl$_3$ is studied with inelastic neutron scattering. The spectrum exhibits an unusually sharp feature within a broad continuum, as well as conventional spin waves. By including both …
View article: Anharmonic lattice dynamics and superionic transition in AgCrSe <sub>2</sub>
Anharmonic lattice dynamics and superionic transition in AgCrSe <sub>2</sub> Open
Significance Unveiling the unusual atomic dynamics in superionic conductors is critical for the design of energy conversion and storage materials, for example to rationalize their thermal transport properties in thermoelectric applications…
View article: First Experiments: New Science Opportunities at the Spallation Neutron Source Second Target Station (abridged)
First Experiments: New Science Opportunities at the Spallation Neutron Source Second Target Station (abridged) Open
This brochure is an abridged version of a more comprehensive companion report. DOE proposes to build a Second Target Station (STS) at SNS to produce beams of cold neutrons with world-leading peak brightness at a repetition rate of 15 Hz, p…
View article: Molecular origins of bulk viscosity in liquid water
Molecular origins of bulk viscosity in liquid water Open
The shear viscous response of water is closely associated with changes in network connectivity on the sub ps timescale. The bulk viscous response is shown here to be associated with local density fluctuations and rotational motion around 1…
View article: First Experiments: New Science Opportunities at the Spallation Neutron Source Second Target Station
First Experiments: New Science Opportunities at the Spallation Neutron Source Second Target Station Open
Leadership in materials science underpins future technologies in energy, security, and other applications that drive this nation’s economy. Neutron scattering is among the crucial characterization techniques necessary to ensure a world-lea…