Matthias Frontzek
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View article: Fingerprinting the Water and Vacancy Sites in Superhydrous Hematite: Neutron Scattering and First Principles Studies
Fingerprinting the Water and Vacancy Sites in Superhydrous Hematite: Neutron Scattering and First Principles Studies Open
Hematite (α-Fe2O3) is a low-cost, naturally abundant, and stable iron oxide with promising applications in energy applications such as photoelectrochemical water splitting, piezocatalysis, and microbial fuel cells. A superhydrous form, hyd…
View article: Local Inversion Symmetry Breaking and Thermodynamic Evidence for Ferrimagnetism in Fe<sub>3</sub>GaTe<sub>2</sub>
Local Inversion Symmetry Breaking and Thermodynamic Evidence for Ferrimagnetism in Fe<sub>3</sub>GaTe<sub>2</sub> Open
The layered compound Fe3GaTe2 is attracting attention due to its high Curie temperature, low dimensionality, and the presence of topological spin textures above room temperature, making Fe3GaTe2 …
View article: Anomalous Hall effect from inter-superlattice scattering in a noncollinear antiferromagnet
Anomalous Hall effect from inter-superlattice scattering in a noncollinear antiferromagnet Open
View article: A planning tool for neutron powder diffraction experiments
A planning tool for neutron powder diffraction experiments Open
We introduce a computer program to simulate the results of neutron powder-diffraction experiments at the High Flux Isotope Reactor at Oak Ridge National Laboratory. The program is freely available as a web application at http://addie.ornl.…
View article: Spin density wave and van Hove singularity in the kagome metal CeTi3Bi4
Spin density wave and van Hove singularity in the kagome metal CeTi3Bi4 Open
View article: Spin Waves in Dirac Semimetal <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Ca</mml:mi></mml:mrow><mml:mrow><mml:mn>0.6</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>0.4</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>MnSb</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:mrow></mml:math> Investigated with Neutrons by the Diffraction Method
Spin Waves in Dirac Semimetal Investigated with Neutrons by the Diffraction Method Open
The tunability of Dirac semimetals with antiferromagnetic Mn layers is of great interest. The observed sign change of interlayer magnetic coupling between CaMnBi_{2} and SrMnBi_{2} suggests ionic substitution as a potential tuning mechanis…
View article: Spin density wave and van Hove singularity in the kagome metal CeTi3Bi4
Spin density wave and van Hove singularity in the kagome metal CeTi3Bi4 Open
Kagome metals with van Hove singularities near the Fermi level can host intriguing quantum phenomena such as chiral loop currents, electronic nematicity, and unconventional superconductivity. However, to our best knowledge, unconventional …
View article: Anomalous Hall effect from inter-superlattice scattering in a noncollinear antiferromagnet
Anomalous Hall effect from inter-superlattice scattering in a noncollinear antiferromagnet Open
Superlattice formation dictates the physical properties of many materials, including the nature of the ground state in magnetic materials. Chemical composition is commonly considered to be the primary determinant of superlattice identity, …
View article: Nanometric modulations of the magnetic structure of the element Nd
Nanometric modulations of the magnetic structure of the element Nd Open
The rare earth neodymium arguably exhibits the most complex magnetic ordering and series of magnetic phase transitions of the elements. Here we report the results of small-angle neutron scattering (SANS) measurements as a function of tempe…
View article: Spin waves in Dirac semimetal Ca$_{0.6}$Sr$_{0.4}$MnSb$_2$ investigated with neutrons by the diffraction method
Spin waves in Dirac semimetal Ca$_{0.6}$Sr$_{0.4}$MnSb$_2$ investigated with neutrons by the diffraction method Open
We report neutron diffraction measurements of Ca$_{0.6}$Sr$_{0.4}$MnSb$_2$, a low-carrier-density Dirac semimetal in which the antiferromagnetic Mn layers are interleaved with Sb layers that host Dirac fermions. We have discovered that we …
View article: Codimension-Two Spiral Spin-Liquid in the Effective Honeycomb-Lattice Compound Cs$_3$Fe$_2$Cl$_9$
Codimension-Two Spiral Spin-Liquid in the Effective Honeycomb-Lattice Compound Cs$_3$Fe$_2$Cl$_9$ Open
A codimension-two spiral spin-liquid is a correlated paramagnetic state with one-dimensional ground state degeneracy hosted within a three-dimensional lattice. Here, via neutron scattering experiments and numerical simulations, we establis…
View article: Quantum critical behavior of the hyperkagome magnet <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">Mn</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mi>CoSi</mml:mi></mml:math>
Quantum critical behavior of the hyperkagome magnet Open
β-Mn-type family alloys Mn3TX (T=Co, Rh, and Ir; X=Si and Ge) have a three-dimensional antiferromagnetic (AF) corner-shared triangular network, i.e., the hyperkagome lattice. The antiferromagnet Mn3RhSi shows magnetic short-range order ove…
View article: Dipolar Spin Ice Regime Proximate to an All-In-All-Out Néel Ground State in the Dipolar-Octupolar Pyrochlore <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Ce</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>Sn</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>7</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
Dipolar Spin Ice Regime Proximate to an All-In-All-Out Néel Ground State in the Dipolar-Octupolar Pyrochlore Open
The dipolar-octupolar (DO) pyrochlores, R2M2O7 (R=Ce,Sm,Nd), are key players in the search for realizable novel quantum spin liquid (QSL) states as a large parameter space within the DO pyrochlore phase diagram is theorized to host QSL sta…
View article: Structure and properties of NdCuGa <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si115.svg" display="inline" id="d1e999"> <mml:msub> <mml:mrow/> <mml:mrow> <mml:mn>3</mml:mn> </mml:mrow> </mml:msub> </mml:math> single crystals
Structure and properties of NdCuGa single crystals Open
View article: Anisotropic magnetism of the Shastry-Sutherland lattice material <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Ba</mml:mi><mml:msub><mml:mi>Nd</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi>Pt</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>5</mml:mn></mml:msub></mml:mrow></mml:math>
Anisotropic magnetism of the Shastry-Sutherland lattice material Open
For this work, single crystals were grown and characterized to investigate the physical properties and magnetic ground state of BaNd2PtO5, a candidate to host physics of the Shastry-Sutherland model. Analysis of singl…
View article: Multi-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>k</mml:mi></mml:math> magnetic structure and large anomalous Hall effect in candidate magnetic Weyl semimetal NdAlGe
Multi- magnetic structure and large anomalous Hall effect in candidate magnetic Weyl semimetal NdAlGe Open
The magnetic structure, magnetoresistance (MR), and Hall effect of the noncentrosymmetric magnetic semimetal NdAlGe are investigated, revealing an unusual magnetic state and anomalous transport properties that are associated with the elect…
View article: ANDiE the Autonomous Neutron Diffraction Explorer
ANDiE the Autonomous Neutron Diffraction Explorer Open
Here, we developed the Autonomous Neutron Diffraction Explorer (ANDiE) to autonomously perform neutron diffraction measurements to discover the magnetic ordering behavior in a material. Neutron diffraction is one of the few techniques that…
View article: Impact of Erbium Doping in the Structural and Magnetic Properties of the Anisotropic and Frustrated SrYb2O4 Antiferromagnet
Impact of Erbium Doping in the Structural and Magnetic Properties of the Anisotropic and Frustrated SrYb2O4 Antiferromagnet Open
We present a systematic study of the structural and magnetic properties of a series of powder samples of SrYb2−xErxO4 with different Yb/Er concentrations. Magnetometry and neutron diffraction have been used to study the magnetic ground sta…
View article: Search for octupolar order in NpO2 by neutron powder diffraction
Search for octupolar order in NpO2 by neutron powder diffraction Open
View article: Relationship between magnetoresistance behavior and magnetic states in intercalated compounds <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Fe</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>TiS</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
Relationship between magnetoresistance behavior and magnetic states in intercalated compounds Open
Here, temperature and field-dependent neutron powder diffraction (NPD) measurements have been performed to reveal the nature of the unusual evolution of the magnetoresistance behavior with increasing Fe content in the intercalated compound…
View article: Selective thermal neutron transmutation doping with Gd masks in GaN semiconductors
Selective thermal neutron transmutation doping with Gd masks in GaN semiconductors Open
View article: Quantitative texture analysis at the WAND<sup>2</sup> and HIDRA diffractometers
Quantitative texture analysis at the WAND<sup>2</sup> and HIDRA diffractometers Open
Data collection and analysis strategies have been developed for efficient and reliable crystallographic texture measurements at two recently upgraded neutron diffractometers: the Wide Angle Neutron Diffractometer Squared (WAND 2 ) and the …
View article: Cover Picture: An Easy‐to‐Use Custom‐Built Cell for Neutron Powder Diffraction Studies of Rechargeable Batteries (Chem. Methods 10/2022)
Cover Picture: An Easy‐to‐Use Custom‐Built Cell for Neutron Powder Diffraction Studies of Rechargeable Batteries (Chem. Methods 10/2022) Open
The Front Cover shows a battery cell designed for in operando neutron powder diffraction. The picture seeks to illustrate the experiment process where lithium ions are moving into the crystal structure of the battery cathode during dischar…
View article: An Easy‐to‐Use Custom‐Built Cell for Neutron Powder Diffraction Studies of Rechargeable Batteries
An Easy‐to‐Use Custom‐Built Cell for Neutron Powder Diffraction Studies of Rechargeable Batteries Open
Invited for this month's cover is the group of Daniel R. Sørensen at the University of Aarhus (Denmark) and at the University of Lund (Sweden). The cover picture shows a battery cell designed for in operando neutron powder diffraction. The…
View article: Magnetic Interactions of the Centrosymmetric Skyrmion Material <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Gd</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>PdSi</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
Magnetic Interactions of the Centrosymmetric Skyrmion Material Open
The experimental realization of magnetic skyrmion crystals in centrosymmetric materials has been driven by theoretical understanding of how a delicate balance of anisotropy and frustration can stabilize topological spin structures in appli…
View article: Mechanical Activation and Cation Site Disorder in MgAl2O4
Mechanical Activation and Cation Site Disorder in MgAl2O4 Open
The synthesis and crystallographic site occupancy were investigated for MgAl2O4 with and without mechanical activation of the precursor powders. Heating to 1200 °C or higher resulted in the formation of a single spinel phase regardless of …
View article: An Easy‐to‐Use Custom‐Built Cell for Neutron Powder Diffraction Studies of Rechargeable Batteries
An Easy‐to‐Use Custom‐Built Cell for Neutron Powder Diffraction Studies of Rechargeable Batteries Open
In operando powder diffraction remains one of the most powerful tools for non‐destructive investigation of battery electrode materials. While in operando X‐ray, especially synchrotron radiation, powder diffraction is by now a routine exper…
View article: Towards understanding the magnetic properties of the breathing pyrochlore compound Ba3Yb2Zn5O11through single-crystal studies
Towards understanding the magnetic properties of the breathing pyrochlore compound Ba3Yb2Zn5O11through single-crystal studies Open
View article: Spiral Spin Liquid on a Honeycomb Lattice
Spiral Spin Liquid on a Honeycomb Lattice Open
Spiral spin-liquids are correlated paramagnetic states with degenerate propagation vectors forming a continuous ring or surface in reciprocal space. On the honeycomb lattice, spiral spin-liquids present a novel route to realize emergent fr…