Publications (33)
Refined spin Hamiltonian on the Cairo pentagonal lattice of Bi2Fe4O9
Emma Y. Lenander, Frida B. Nielsen, Jakob Lass +14
The frustrated magnet Bi2Fe4O9 has been reported to exhibit complex spin dynamics coexisting with conventional spin wave excitations. The magnetic Fe3+ (S = 5/2) ions are arranged…
Effects of uniaxial pressure on the spin ice Ho2Ti2O7
Richard Edberg, Ingrid Marie Bergh Bakke, Hirotaka Kondo +11
The spin ice materials Ho2Ti2O7 and Dy2Ti2O7 are experimental and theoretical exemplars of highly frustrated magnetic materials. However, the effects of an applied uniaxial pressur…
Complex magnetic interactions in geometrically frustrated TbOF
Pim Witte, Denis Sheptyakov, Elsa Lhotel +5
We have identified TbOF as a unique frustrated and mixed-anion lattice, hosting unconventional magnetism. By means of magnetization, specific heat and neutron diffraction measureme…
Direct detection of hydrogen reveals a new macroscopic crustal water reservoir on early Mars
Estrid Buhl Naver, Katrine Wulff Nikolajsen, Martin Sæbye Carøe +13
The next great leap in Martian exploration will be the return of samples to Earth. To ensure the maximum scientific return from studying these samples, the development and utilisat…
Gradual emergence of superconductivity in underdoped LSCO
Ana-Elena Tutueanu, Machteld E. Kamminga, Tim B. Tejsner +13
We present triple-axis neutron scattering studies of low-energy magnetic fluctuations in strongly underdoped LaSrCuO with , and , providing…
Nature of the magnetic stripes in fully oxygenated LaCuO
Ana-Elena Tutueanu, Henrik Jacobsen, Pia Jensen Ray +12
We present triple-axis neutron scattering studies of static and dynamic magnetic stripes in an optimally oxygen-doped cuprate superconductor, LaCuO, which exhibits a…
Approximate resolution convolution function for fitting a dispersion gap measured on a triple-axis spectrometer
Emma Y. Lenander, Silas B. Schack, Kim Lefmann +1
We present an analytic convoluted-gap function, eq. 11 in the manuscript, for fitting dispersion gaps measured on triple-axis spectrometers (TAS). At the gap, the instrumental reso…
Simulation of waviness in neutron guides
Ursula Bengaard Hansen, Mads Bertelsen, Erik Bergbäck Knudsen +1
As the trend of neutron guide designs points towards longer and more complex guides, imperfections such as waviness becomes increasingly important. Simulations of guide waviness ha…
Structural Evolution and Onset of the Density Wave Transition in the CDW Superconductor LaPtSi Clarified with Synchrotron XRD
Elisabetta Nocerino, Irene San Lorenzo, Konstantinos Papadopulos +11
The quasi-2D Pt-based rare earth intermetallic material LaPtSi has attracted attention as it exhibits strong interplay between charge density wave (CDW) and and superconduc…
Evolution of magnetic stripes under uniaxial stress in LaBaCuO studied by neutron scattering
Machteld E. Kamminga, Kristine M. L. Krighaar, Astrid T. Rømer +6
Here we present the effect of uniaxial stress on the magnetic stripes in the cuprate system LaBaCuO with , previously found to have a stress-induced en…
Spin dynamics of the director state in frustrated hyperkagome systems
Henrik Jacobsen, Ovidiu Florea, Elsa Lhotel +10
We present an experimental study of the magnetic structure and dynamics of two frustrated hyperkagome compounds, Gd3Ga5O12 and Gd3Al5O12. It has previously been shown that Gd3Ga5O1…
Solvothermal vapor annealing and environmental control setup with adjustable magnetic field module for GISAXS studies
Christian Kjeldbjerg, Bo Jakobsen, Miriam Varón +3
A compact, modular environmental control and solvothermal vapor annealing chamber designed for maintaining a controlled atmosphere with regard to solvent humidity and temperature i…
Solitonic lattice and Yukawa forces in the rare earth orthoferrite TbFeO3
Sergey Artyukhin, Maxim Mostovoy, Niels Paduraru Jensen +13
The control of domains in ferroic devices lies at the heart of their potential for technological applications. Multiferroic materials offer another level of complexity as domains c…
Characterizing the diffuse continuum excitations in the classical spin liquid -YMnO
Jakob Lass, Emma Y. Lenander, Kristine M. L. Krighaar +5
We extend previous inelastic neutron scattering results on the geometrically frustrated antiferromagnet hexagonal-YMnO, which has been suggested to belong to the class of class…
Coherent Epitaxial Semiconductor-Ferromagnetic Insulator InAs/EuS Interfaces: Band Alignment and Magnetic Structure
Yu Liu, Alessandra Luchini, Sara MartÃ-Sánchez +16
Hybrid semiconductor-ferromagnetic insulator heterostructures are interesting due to their tunable electronic transport, self-sustained stray field and local proximitized magnetic…
Emergence of low-energy spin waves in superconducting electron-doped cuprates
Kristine M. L. Krighaar, Jeppe J. Cederholm, Ellen M. S. Schriver +11
In order to fully utilize the technological potential of unconventional superconductors, an enhanced understanding of the superconducting mechanism is necessary. In the best perfor…
Dipolar Spin Ice Under Uniaxial Pressure
Richard Edberg, Lise Ãrduk Sandberg, Ingrid Marie Bergh Bakke +8
The magnetically frustrated spin ice family of materials is host to numerous exotic phenomena such as magnetic monopole excitations and macroscopic residual entropy extending to lo…
Magnetic monopole relaxation effects in spin ice DyTiO
Richard Edberg, Akash Khansili, Ingrid Marie Fjellvåg +5
Spin ice compounds enable the exploration of the dynamics of magnetic monopoles in condensed matter systems. In this study, we use ac calorimetry to probe the dynamical response of…
Effects of ground movements on realistic guide models for the European Spallation Source
Asla Husgard, Martin A. Olsen, Rebekka Frøystad +4
We model the effect of ground movement, based on empirical experience, on the transport properties of long neutron guides by ray-tracing simulations. Our results reproduce the larg…
Characterization of the BIFROST spectrometer through virtual experiments
Kristine M. L. Krighaar, Silas B. Schack, Nicolai L. Amin +3
Using the Monte Carlo ray tracing package McStas, we illustrate the possibilities of creating virtual experiments of the neutron spectrometer BIFROST at the European Spallation Sou…
Magnetic Bloch Oscillations and domain wall dynamics in a near-Ising ferromagnetic chain
Ursula B. Hansen, Olav F. Syljuåsen, Jens Jensen +5
When charged particles in periodic lattices are subjected to a constant electric field, they respond by oscillating. Here we demonstrate that the magnetic analogue of these Bloch o…
Emergent magnetic behaviour in the frustrated YbGaO garnet
Lise Orduk Sandberg, Richard Edberg, Kasper S. Pedersen +10
We report neutron scattering, magnetic susceptibility and Monte Carlo theoretical analysis to verify the short range nature of the magnetic structure and spin-spin correlations in…
Diffuse spin waves, zero modes and cluster excitations in the spin-3/2 kagomé antiferromagnet chromium jarosite, KCr(OD)(SO)
Sofie Holm-Janas, Sidse L. Lolk, Anders B. A. Andersen +5
The dynamics of the S = 3=2 kagome antiferromagnet chromium jarosite, KCr(OD)(SO) was studied using high-resolution neutron time-of-flight spectroscopy on a polycry…
An inelastic neutron scattering study of the magnetic field dependence of the quantum dipolar garnet: YbGaO
Edward Riordan, Monica Ciomaga Hatnean, Geetha Balakrishnan +5
The garnet compound YbGaO is a fascinating material that is considered highly suitable for low-temperature refrigeration, via the magnetocaloric effect, in addition…
A Prismatic Analyser concept for Neutron Spectrometers
Jonas O Birk, Márton Markó, Paul G Freeman +5
A development in modern neutron spectroscopy is to avoid the need of large samples. We demonstrate how small samples together with the right choice of analyser and detector compone…
Simulating neutron diffraction from deformed mosaic crystals in McStas
Daniel Lomholt Christensen, Sandra Cabeza, Thilo Pirling +2
Monochromator and analyzer systems that rely on bent single crystals are in use throughout the neutron scattering community. We here introduce a new component to the neutron simula…
MJOLNIR: A Software Package for Multiplexing Neutron Spectrometers
Jakob Lass, Henrik Jacobsen, Daniel G. Mazzone +1
Novel multiplexing triple-axis neutron scattering spectrometers yield significant improvements of the common triple-axis instruments. While the planar scattering geometry keeps ens…
Nanocriticality in the magnetic phase transition of CoO nanoparticles
Machteld E. Kamminga, Jonas Okkels Birk, Jari à Hjøllum +11
The universal theory of critical phase transitions describes the critical behavior at second-order phase transitions in infinitely large systems. With the increased contemporary in…
Accurate simulations of magnetic excitations in the neutron simulation package McStas
Silas B. Schack, Kristine M. L. Krighaar, Emma Y. Lenander +1
A new component for the accurate simulation of neutron scattering from magnetic excitations has been developed for the neutron ray-tracing software McStas. The component SpinWave_B…
Classical spin liquid or extended critical range in h-YMnO?
Sofie Janas, Jakob Lass, Ana-Elena Tutueanu +8
Inelastic neutron experiments on the classical triangular-lattice geometrically frustrated antiferromagnet h-YMnO reveal diffuse, gapless magnetic excitations present both belo…
Multinomial, Poisson and Gaussian statistics in count data analysis
Jakob Lassa, Magnus Egede Bøggild, Per Hedegård +1
It is generally known that counting statistics is not correctly described by a Gaussian approximation. Nevertheless, in neutron scattering, it is common practice to apply this appr…
Non-Conventional Critical Behavior and Q-dependent Electron-Phonon Coupling Induced Phonon Softening in the CDW Superconductor LaPt2Si2
Elisabetta Nocerino, Uwe Stuhr, Irene San Lorenzo +12
This paper reports the first experimental observation of phonons and their softening on single crystalline LaPtSi via inelastic neutron scattering. From the temperature dep…
Monolithic atom interferometry
Johannes Fiedler, Kim Lefmann, Wolf von Klitzing +1
Atom and, more recently, molecule interferometers are used in fundamental research and industrial applications. Most atom interferometers rely on gratings made from laser beams, wh…