A5053224241- Advanced Condensed Matter Physics
- Multiferroics and related materials
- Magnetic and transport properties of perovskites and related materials
- Theoretical and Computational Physics
- Topological Materials and Phenomena
- Rare-earth and actinide compounds
- Graphene research and applications
- Thermodynamic and Structural Properties of Metals and Alloys
- Iron-based superconductors research
- Crystallography and Radiation Phenomena
- Magneto-Optical Properties and Applications
- Thermal properties of materials
- Quasicrystal Structures and Properties
- Geophysics and Sensor Technology
- Earthquake Detection and Analysis
- High-pressure geophysics and materials
- Inorganic Chemistry and Materials
- Magnetic properties of thin films
- Characterization and Applications of Magnetic Nanoparticles
- Physics of Superconductivity and Magnetism
TU Dresden
2022-2025
<a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:msub><a:mi>EuAl</a:mi><a:mn>4</a:mn></a:msub></a:math> is a rare-earth intermetallic in which competing itinerant and/or indirect exchange mechanisms give rise to complex magnetic phase diagram, including centrosymmetric skyrmion lattice. These phenomena arise not the tetragonal parent structure but presence of charge-density wave (CDW), lowers crystal symmetry and renormalizes electronic structure. Microscopic knowledge corresponding...
CaMn$_2$P$_2$ exemplifies the realization of a frustrated $J_1$-$J_2$-$J_3$ Heisenberg model corrugated honeycomb magnetic lattice. Previous studies show that below N\'eel temperature ($T_{\rm N}$), system forms cycloidal $6\times 6$ $ab$-plane unit cell conforms with various space groups. Here, we present single-crystal neutron-diffraction across expansive reciprocal-space volumes, confirming structure while uncovering further distinctive features. We find evidence for three domains,...
Simultaneous breaking of time reversal and inversion symmetries in multiferroics couples ferroelectricity to magnetism is a source unusual physical phenomena that can be used next-generation electronic devices. A notable example DyFeO$_3$, which under applied magnetic fields exhibits giant linear magnetoelectric response large spontaneous electric polarization induced by coexisting orders Fe Dy spins. Here, we use high-resolution neutron diffraction show at zero field DyFeO$_3$ hosts an...
Centrosymmetric compounds which host three-dimensional topological spin structures comprise a distinct subclass of materials in multiple-<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mi mathvariant="bold">q</a:mi></a:mrow></a:math> magnetic order is stabilized by anisotropy and bond frustration contrast to the more common path antisymmetric exchange interactions. Here we investigate static dynamic properties cubic perovskite <d:math...
The cubic perovskite ${\text{SrFeO}}_{\text{3}}$ was recently reported to host hedgehog- and skyrmion-lattice phases in a highly symmetric crystal structure which does not support the Dzyaloshinskii-Moriya interactions commonly invoked explain such magnetic order. Hints of complex phase diagram have also been found powder samples single-layer Ruddlesden-Popper analog ${\text{Sr}}_{\text{2}}{\text{FeO}}_{\text{4}}$, so reinvestigation bilayer material...
EuAl$_4$ is a rare earth intermetallic in which competing itinerant and/or indirect exchange mechanisms give rise to complex magnetic phase diagram, including centrosymmetric skyrmion lattice. These phenomena arise not the tetragonal parent structure but presence of charge density wave (CDW), lowers crystal symmetry and renormalizes electronic structure. Microscopic knowledge corresponding atomic modulations their driving mechanism prerequisite for deeper understanding resulting equilibrium...
Spin-nematic and spin-smectic phases have been reported in magnetic materials, which break rotational symmetry while preserving translational along certain directions. However, until now the analogy to liquid crystals remained incomplete because no analog of cholesteric order was known. Here we show that bilayer perovskite Sr$_3$Fe$_2$O$_7$, previously believed adopt a simple single-$\mathbf{q}$ spin-helical order, hosts two distinct types multi-$\mathbf{q}$ spin textures first...
Abstract Topologically nontrivial magnetic structures such as skyrmion lattices are well known in materials lacking lattice inversion symmetry, where antisymmetric exchange interactions allowed. Only recently, topological multi- q textures that spontaneously break the chiral for example, three-dimensional hedgehog lattices, were discovered centrosymmetric compounds, they instead driven by frustrated interactions. Here we show bilayer perovskite Sr 3 Fe 2 O 7 , previously believed to adopt a...
Centrosymmetric compounds which host three-dimensional topological spin structures comprise a distinct subclass of materials in multiple-$\mathbf{q}$ magnetic order is stabilized by anisotropy and bond frustration contrast to the more common path antisymmetric exchange interactions. Here we investigate static dynamic properties cubic perovskite SrFeO$_3$ $\unicode{x2013}$ rare example centrosymmetric material hosting two types textures: skyrmion- hedgehog-lattice phases. Our detailed...
The spiral spin liquid (SSL) is a highly degenerate state characterized by continuous contour or surface in reciprocal space spanned propagation vector. Although the SSL has been predicted number of various theoretical models, very few materials are so far experimentally identified to host such state. Via combined single-crystal wide-angle and small-angle neutron scattering, we report observation quasi-two-dimensional delafossite AgCrSe$_2$. We show that it close realization ideal Heisenberg...
The topology of electronic and phonon band structures graphene is well studied known to exhibit a Dirac cone at the $K$ point Brillouin zone. Here, we applied inelastic x-ray scattering (IXS) along with ab initio calculations investigate in graphite, 3D analog graphene. We identified pair modes that form very weakly gapped linear anticrossing can be essentially viewed as approximant. IXS intensity vicinity quasi-Dirac reveals harmonic modulation spectral weight above below energy, which was...
We present a comprehensive study of static and dynamic magnetic properties in the Ising-like dipolar antiferromagnet (AFM) DyScO$_3$\ by means DC AC magnetization measurements supported classical Monte-Carlo calculations. Our AC-susceptibility data show that dynamics exhibit clear crossover from an Arrhenius-like regime to quantum tunneling (QTM) at $T^* = 10$ K. Below $T_{\mathrm{N}} 3.2$ K DyScO$_3$ orders antiferromagnetic $GxAy$-type structure slow down minute timescale. The...
The cubic perovskite SrFeO$_3$ was recently reported to host hedgehog- and skyrmion-lattice phases in a highly symmetric crystal structure which does not support the Dzyaloshinskii-Moriya interactions commonly invoked explain such magnetic order. Hints of complex phase diagram have also been found powder samples single-layer Ruddlesden-Popper analog Sr$_2$FeO$_4$, so reinvestigation bilayer material Sr$_3$Fe$_2$O$_7$, believed be simple helimagnet, is called for. Our magnetization...
The topology of electronic and phonon band structures graphene is well studied known to exhibit a Dirac cone at the K point Brillouin zone. Here, we applied inelastic x-ray scattering (IXS) along with ab initio calculations investigate in graphite, 3D analog graphene. We identified pair modes that form very weakly gapped linear anticrossing can be essentially viewed as approximant. IXS intensity vicinity quasi-Dirac reveals harmonic modulation spectral weight above below energy, which was...