Raphaël P. Hermann
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View article: Constraints on magnetism and correlations in RuO2 from lattice dynamics and Mössbauer spectroscopy
Constraints on magnetism and correlations in RuO2 from lattice dynamics and Mössbauer spectroscopy Open
We provide experimental evidence for the absence of a magnetic moment in bulk RuO$_2$, a candidate altermagnetic material, by using a combination of Mössbauer spectroscopy, nuclear forward scattering, inelastic X-ray and neutron scattering…
View article: Tuning the magnetic properties of the spin-split antiferromagnet MnTe through pressure
Tuning the magnetic properties of the spin-split antiferromagnet MnTe through pressure Open
The hexagonal antiferromagnet MnTe has attracted enormous interest as a prototypical example of a spin-compensated magnet in which the combination of crystal and spin symmetries lifts the spin degeneracy of the electron bands without the n…
View article: A Mössbauer Spectroscopy Investigation of Nickel‐Zinc Ferrites Synthesized by a Self‐Combustion Method for Soft Magnetic Core Applications
A Mössbauer Spectroscopy Investigation of Nickel‐Zinc Ferrites Synthesized by a Self‐Combustion Method for Soft Magnetic Core Applications Open
Soft ferrites are materials of interest for magnetic cores, as used for wireless charging transformers. Their low permeabilities, high resistivity, and magnetic polarization make them interesting for high‐power electric vehicle charging an…
View article: Giant electric-field induced thermal switching controlled by phonon scattering in a relaxor ferroelectric
Giant electric-field induced thermal switching controlled by phonon scattering in a relaxor ferroelectric Open
The demand for high energy efficiency drives intense interest in thermal management technology. The active control of heat flow in materials can dramatically enhance device efficiency. Phonons are a major contributor to heat transfer in so…
View article: Constraints on magnetism and correlations in RuO$_2$ from lattice dynamics and Mössbauer spectroscopy
Constraints on magnetism and correlations in RuO$_2$ from lattice dynamics and Mössbauer spectroscopy Open
We provide experimental evidence for the absence of a magnetic moment in bulk RuO$_2$, a candidate altermagnetic material, by using a combination of Mössbauer spectroscopy, nuclear forward scattering, inelastic X-ray and neutron scattering…
View article: Constraints on magnetism and correlations in RuO2 from lattice dynamics and Mössbauer spectroscopy
Constraints on magnetism and correlations in RuO2 from lattice dynamics and Mössbauer spectroscopy Open
We provide experimental evidence for the absence of a magnetic moment in bulk RuO2, a candidate altermagnetic material, by using a combination of Mössbauer spectroscopy, nuclear forward scattering, inelastic X-ray and neutron scattering, a…
View article: Altermagnetic behavior in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>OsO</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>: Parallels with <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>RuO</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>
Altermagnetic behavior in : Parallels with Open
We investigate and compare the electronic structure of OsO2 with the extensively studied RuO2. Calculations show that OsO2 exhibits antiferromagnetism and spin splitting driven by crystal symmetry, a characteristic of altermagnetism and si…
View article: Inhibition of Reaction Layer Formation on MgO(100) by Doping with Trace Amounts of Iron
Inhibition of Reaction Layer Formation on MgO(100) by Doping with Trace Amounts of Iron Open
Despite extensive research on MgO's reactivity in the presence of CO2 under various conditions, little is known about whether impurities incorporated into the solid, such as iron, enhance or impede hydroxylation and carbonation reactions. …
View article: Lattice structure and dynamics of sparse molecular crystals: OsO4 and RuO4
Lattice structure and dynamics of sparse molecular crystals: OsO4 and RuO4 Open
This dataset contains input and output files from DFT simulations used to reproduce the electronic and phonon calculations of bulk and molecular OsO₄ and RuO₄. The files include data from initial electronic structure and phonon calculation…
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: Altermagnetic behavior in OsO2: Parallels with RuO2
Altermagnetic behavior in OsO2: Parallels with RuO2 Open
This dataset contains input and output files from DFT simulations used to reproduce the electronic and phonon band structures of bulk OsO₂ and RuO₂. The files include data from initial electronic structure and phonon calculations performed…
View article: Inter- and intratetramer vibrations in OsO4 - 5 K
Inter- and intratetramer vibrations in OsO4 - 5 K Open
Data contains the inelastic scattering data from runs at SNS instruments VISION and ARCS using 2 g of OsO4 in vanadium can. The empty runs are included. Runs at ARCS used 30, 60 and 180 meV incident energy. Refer to the OsO4_ARCS_datafiles…
View article: Neutron powder diffraction, Mossbauer Spectroscopy and Optical Spectroscopy to study magnetic and nuclear lattices in Fe-based oxychlorides Ca2FeO3Cl, Sr2FeO3Cl and Sr3Fe2O5Cl2
Neutron powder diffraction, Mossbauer Spectroscopy and Optical Spectroscopy to study magnetic and nuclear lattices in Fe-based oxychlorides Ca2FeO3Cl, Sr2FeO3Cl and Sr3Fe2O5Cl2 Open
Data for Neutron Diffraction, Mossbauer Spectoscopy and Optical Spectroscopy are contained on all three samples (Ca2FeO3Cl, Sr2FeO3Cl, and Sr3Fe2O5Cl2). Mossbauer data are in the folder "MossbauerSpectroscopy". This contains details of fil…
View article: Supporting Data for "Constraints on magnetism and correlations in RuO2 from lattice dynamics and Mössbauer spectroscopy"
Supporting Data for "Constraints on magnetism and correlations in RuO2 from lattice dynamics and Mössbauer spectroscopy" Open
Contents of this DOI are data for the research paper "Constraints on magnetism and correlations in RuO2 from lattice dynamics and Mossbauer spectroscopy" by the authors: George Yumnam, et. al. The dataset contains data from inelastic x-ray…
View article: Synergy between Ni and Fe in NiFe aerogel oxygen evolution reaction catalyst: <i>in situ</i> <sup>57</sup> Fe Mössbauer and X-ray absorption spectroscopy studies
Synergy between Ni and Fe in NiFe aerogel oxygen evolution reaction catalyst: <i>in situ</i> <sup>57</sup> Fe Mössbauer and X-ray absorption spectroscopy studies Open
In situ spectroscopies reveal the increase of Fe and Ni valence states during oxygen evolution in anion-exchange-membrane water electrolyzers (AEMWE) for hydrogen production.
View article: Influence of Dissolved Iron in Solution on MgO Hydroxylation and Carbonation
Influence of Dissolved Iron in Solution on MgO Hydroxylation and Carbonation Open
MgO (periclase) is a promising material for direct air capture of CO2 using a mineral looping process, but it is unknown how impurities in the environment will affect the CO2 uptake and hence process economics. Here, we investigated the ef…
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: Stoichiometry‐Induced Ferromagnetism in Altermagnetic Candidate MnTe
Stoichiometry‐Induced Ferromagnetism in Altermagnetic Candidate MnTe Open
The field of spintronics has seen a surge of interest in altermagnetism due to novel predictions and many possible applications. MnTe is a leading altermagnetic candidate that is of significant interest across spintronics due to its layere…
View article: Neutron diffraction: a primer
Neutron diffraction: a primer Open
Because of the neutron’s special properties, neutron diffraction may be considered one of the most powerful techniques for structure determination of crystalline and related matter. Neutrons can be released from nuclear fission, from spall…
View article: Giant Modulation of Refractive Index from Picoscale Atomic Displacements
Giant Modulation of Refractive Index from Picoscale Atomic Displacements Open
It is shown that structural disorder—in the form of anisotropic, picoscale atomic displacements—modulates the refractive index tensor and results in the giant optical anisotropy observed in BaTiS 3 , a quasi‐1D hexagonal chalcogenide. Sing…
View article: Magnon gap tuning in lithium-doped MnTe
Magnon gap tuning in lithium-doped MnTe Open
Data in this DOI includes: 1) Powder Diffraction at HFIR POWDER (HB-2A) of pure MnTe and 5%-lithium doped MnTe at various temperatures ranging from T = 4 - 360 K for pure MnTe and T = 4 - 290 K for 5% lithium doped MnTe. 2) Inelastic neutr…
View article: RuO2 - ARCS - powder 300 K
RuO2 - ARCS - powder 300 K Open
Inelastic neutron scattering data on RuO2 polycrystalline 300 K, ARCS.
View article: Giant Modulation of Refractive Index from Picoscale Atomic Displacements
Giant Modulation of Refractive Index from Picoscale Atomic Displacements Open
Structural disorder has been shown to enhance and modulate magnetic, electrical, dipolar, electrochemical, and mechanical properties of materials. However, the possibility of obtaining novel optical and optoelectronic properties from struc…
View article: Vibrations and Phase Stability in Mixed Valence Antimony Oxide
Vibrations and Phase Stability in Mixed Valence Antimony Oxide Open
α-Sb2O4 (cervantite) and β-Sb2O4 (clinocervantite) are mixed valence compounds with equal proportions of SbIII and SbV as represented in the formula SbIIISbVO4. Their structure and properties can be difficult to calculate owing to the SbII…
View article: (Mg,Mn,Fe,Co,Ni)O: A rocksalt high-entropy oxide containing divalent Mn and Fe
(Mg,Mn,Fe,Co,Ni)O: A rocksalt high-entropy oxide containing divalent Mn and Fe Open
High-entropy oxides (HEOs) have aroused growing interest due to fundamental questions relating to their structure formation, phase stability, and the interplay between configurational disorder and physical and chemical properties. Introduc…