0000000000281605

AUTHOR

Chen Luo

showing 3 related works from this author

Al driven peculiarities of local coordination and magnetic properties in single phase Alx CrFeCoNi high entropy alloys

2021

The authors thank the Helmholtz-Zentrum Berlin for the provision of access to synchrotron radiation facilities and allocation of synchrotron radiation at the PM2-VEKMAG, BAMline, and UE46_PGM-1 beamlines of BESSY II at HZB as well as measurement time for magnetometry at HZB CoreLab for Quantum Materials. A. S. acknowledges personal funding from CALIPSOplus project (the Grant Agreement no. 730872 from the EU Framework Programme for Research and Innovation HORIZON 2020). The financial support for the VEKMAG project and the PM2-VEKMAG beamline by the German Federal Ministry for Education and Research (Nos. BMBF 05K10PC2, 05K10WR1, 05K10KE1) and by HZB is cordially acknowledged by all co-author…

Materials scienceAbsorption spectroscopyMagnetometer02 engineering and technologyReverse Monte CarloX-ray magnetic circular dichroism (XMCD)01 natural sciencesMolecular physicsSpectral linereverse Monte Carlolaw.inventionlaw0103 physical sciencesGeneral Materials ScienceElectrical and Electronic Engineering010306 general physicsAbsorption (electromagnetic radiation)high-entropy alloysMagnetic momentMagnetic circular dichroismHigh entropy alloyselement-specific spectroscopy021001 nanoscience & nanotechnologyCondensed Matter PhysicsAtomic and Molecular Physics and Opticsextended X-ray absorption fine structure (EXAFS)high entropy alloys ; reverse Monte Carlo ; magnetism ; element specific spectroscopy ; extended X ray absorption fine structure EXAFS ; X ray magnetic circular dichroism XMCDmagnetism:NATURAL SCIENCES [Research Subject Categories]0210 nano-technology
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Element-specific magnetic properties of mixed 3d−4f metallacrowns

2018

Single molecule magnets comprising rare earth metals are of high interest due to the unquenched orbital moments of the rare earth ions that result in a large energy barrier for magnetization reversal. We investigate the magnetic properties of polynuclear $3d\text{\ensuremath{-}}4f15$-MC-5 metallacrowns using x-ray magnetic circular dichroism of powder samples at a temperature of 7 K in a magnetic field of 7 T. The sum rule analysis reveals element-specific spin and orbital moments. The magnetic moments of the $3d$ transition metal Ni(II) ions are coupled antiferromagnetically to each other and contribute only little to the total molecular moment. The spin and orbital moments of the rare ear…

PhysicsCondensed matter physicsMagnetic moment010405 organic chemistryMagnetic circular dichroism010402 general chemistry01 natural sciences0104 chemical sciencesMagnetic fieldDipoleMagnetic anisotropyMagnetZeeman energySpin (physics)Physical Review B
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Solvent-induced high-spin transition in double-decker 3d–4f metallacrowns

2019

Element-specific magnetic spin and orbital magnetic moments of $3d\text{\ensuremath{-}}4f$ double-decker metallacrown molecules have been investigated using x-ray magnetic circular dichroism. The double-decker metallacrowns comprise one rare-earth Gd(III) or Tb(III) ion embedded between two squared scaffolds of four Ni(II) ions. We observe a strong increase of the Ni(II) moments if the molecules are dissolved in methanol, indicating a spin crossover from a low-spin to a high-spin state. In contrast, dichloromethane does not change the spin state. This result is explained by a change of the coordination environment of nickel. The comparison of charge-transfer multiplet calculations with the …

Materials scienceSpin statesMagnetic momentMagnetic circular dichroismSpin transition02 engineering and technology021001 nanoscience & nanotechnology01 natural sciencesSpin magnetic momentCrystallographySpin crossover0103 physical sciencesCondensed Matter::Strongly Correlated Electrons010306 general physics0210 nano-technologyMultipletMetallacrownPhysical Review B
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