Felix Seewald

ORCID: 0000-0002-6312-8226
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Research Areas
  • Advanced Condensed Matter Physics
  • Multiferroics and related materials
  • Advanced NMR Techniques and Applications
  • Physics of Superconductivity and Magnetism
  • Magnetic and transport properties of perovskites and related materials
  • Magnetism in coordination complexes
  • Iron-based superconductors research
  • Catalysis for Biomass Conversion
  • Lanthanide and Transition Metal Complexes
  • Rare-earth and actinide compounds
  • Catalysts for Methane Reforming
  • Synthetic Organic Chemistry Methods
  • Catalysis and Hydrodesulfurization Studies
  • Cold Atom Physics and Bose-Einstein Condensates
  • X-ray Diffraction in Crystallography
  • Supercapacitor Materials and Fabrication
  • Crystallization and Solubility Studies
  • Advancements in Battery Materials
  • Magnetic Properties and Synthesis of Ferrites
  • Inorganic Chemistry and Materials
  • Metal-Catalyzed Oxygenation Mechanisms
  • Porphyrin and Phthalocyanine Chemistry
  • Magnetic Properties of Alloys

TU Dresden
2020-2025

Leibniz Institute for Solid State and Materials Research
2023

The present studies show that long-range magnetic order takes place in ${\mathrm{RuBr}}_{3}$ at $\ensuremath{\approx}34$ K. observations of clear oscillations the muon time spectra demonstrate presence well-defined internal fields sites. ordering appears to be very robust and static, suggesting a more conventional nature system zero field. Present investigations prove Kitaev interactions are likely weakened field comparison $\ensuremath{\alpha}\text{\ensuremath{-}}{\mathrm{RuCl}}_{3}$...

10.1103/physrevb.109.014440 article EN Physical review. B./Physical review. B 2024-01-31

Our experimental (neutron diffraction, M\"ossbauer spectroscopy, magnetic susceptibility, specific heat) and numerical studies on the evolution of short- long-range order in $\gamma_{\rm II}$-Li\(_2\)FeSiO\(_4\) suggest a quasi-two-dimensional (2D) nature magnetism. The data obtained single crystals imply antiferromagnetic below $T_{\rm N}= 17$~K. A broad maximum susceptibility $\chi$ at m}\simeq 28$~K, observation entropy changes up to 100~K anisotropy are indicative low-dimensional...

10.48550/arxiv.2501.01758 preprint EN arXiv (Cornell University) 2025-01-03

Our experimental (neutron diffraction, Mössbauer spectroscopy, magnetic susceptibility, specific heat) and numerical studies on the evolution of short- long-range order in γII−Li2FeSiO4 suggest a quasi-two-dimensional (2D) nature magnetism. The data obtained single crystals imply antiferromagnetic below TN=17 K. A broad maximum susceptibility χ at Tm≃28 K, observation entropy changes up to 100 anisotropy are indicative low-dimensional magnetism short-range correlations 200 Neutron...

10.1103/physrevb.111.024414 article EN Physical review. B./Physical review. B 2025-01-17

The trinuclear high-spin iron(III) complex [Fe3Cl3(saltagBr)(py)6]ClO4 {H5saltagBr = 1,2,3-tris[(5-bromo-salicylidene)amino]guanidine} was synthesized and characterized by several experimental theoretical methods. exhibits molecular 3-fold symmetry imposed the rigid ligand backbone crystallizes in trigonal space group P3̅ with cation lying on a crystallographic C3 axis. states (S 5/2) of individual ions were determined Mößbauer spectroscopy confirmed CASSCF/CASPT2 ab initio calculations....

10.1021/acs.inorgchem.2c03455 article EN Inorganic Chemistry 2023-02-16

We present a systematic ${}^{57}\mathrm{Fe}$ M\"ossbauer study on highly diluted Fe centers in ${\mathrm{Li}}_{2}({\mathrm{Li}}_{1\ensuremath{-}x}{\mathrm{Fe}}_{x})\mathrm{N}$ single crystals as function of temperature and magnetic field applied transverse longitudinal with respect to the single-ion anisotropy axis. Below 30 K, exhibit giant hyperfine ${\overline{B}}_{A}=70.25(2)\phantom{\rule{4pt}{0ex}}\mathrm{T}$ parallel axis strongest electric gradient...

10.1103/physrevb.102.054426 article EN Physical review. B./Physical review. B 2020-08-19

Abstract For sustainable production of chemicals like hydrocarbons and oxygenates from renewable carbon sources electricity Fischer‐Tropsch synthesis is focused in current research. Aiming for this purpose, the development supported powdered shaped catalysts low‐temperature value‐added higher alcohols was addressed study. Promising support materials α‐Al 2 O 3 , SiO ZrO SiC were assessed influence electrochemical promoters on product formation investigated. The results show an outstanding...

10.1002/cctc.202300572 article EN cc-by-nc ChemCatChem 2023-08-08

Abstract The synthesis of various metal acetylene dicarboxylates (M x ADC, M=Cu, Ag, Fe, Co, Ni) via new methods are reported. previously unknown crystal structures for Ag 2 ADC and FeADC presented. behaviour the different their role as graphitization catalysts in a printable highly energetic carbon precursor is investigated detail. Despite copper compound has lowest decomposition temperature all studied significantly enhancing conductivity thin films obtained at low pyrolysis temperatures,...

10.1002/ejic.202400372 article EN cc-by-nc European Journal of Inorganic Chemistry 2024-08-12

10.1107/s2053273324095317 article Acta Crystallographica Section A Foundations and Advances 2024-08-26

The present studies show that long-range magnetic order takes place in RuBr$_3$ at $\approx$ 34 K. observations of clear oscillations the muon time spectra demonstrate presence well-defined internal fields sites. ordering appears to be very robust and static suggesting a more conventional nature system zero field. Present investigations prove Kitaev interactions are likely weakened field comparison $\alpha$-RuCl$_3$ system. This proves it is possible tune by replacing Cl with heavier halogen...

10.48550/arxiv.2311.03800 preprint EN public-domain arXiv (Cornell University) 2023-01-01

Consolidating a microscopic understanding of magnetic properties is crucial for rational design materials with tailored characteristics. The interplay 3d and 4f magnetism in rare-earth transition metal antimonides an ideal platform to search such complex behavior. Here the synthesis, crystal growth, structure, are reported new compound Pr3 Fe3 Sb7 as studied by magnetization electrical transport measurements static pulsed fields up 56 T, powder neutron diffraction, Mößbauer spectroscopy. On...

10.1002/adma.202207945 article EN cc-by Advanced Materials 2022-11-30
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