0000000000054968

AUTHOR

Ralph Claessen

showing 4 related works from this author

Bulk spin polarization of magnetite from spin-resolved hard x-ray photoelectron spectroscopy

2021

Physical review / B 104(4), 045129 (1-10) (2021). doi:10.1103/PhysRevB.104.045129

Materials scienceCondensed matter physicsSpintronicsSpin polarizationPhotoemission spectroscopyFermi levelPolarization (waves)530chemistry.chemical_compoundsymbols.namesakeCondensed Matter::Materials ScienceX-ray photoelectron spectroscopychemistrysymbolsddc:530Spin (physics)Magnetite
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New HAXPES Applications at PETRA III

2018

The application of photoelectron spectroscopy using hard X-rays (HAXPES) is becoming increasingly popular as a powerful spectroscopic tool in materials science. The success of HAXPES lies in the fa...

Nuclear and High Energy PhysicsMaterials scienceX-ray photoelectron spectroscopy0103 physical sciencesNanotechnology02 engineering and technology021001 nanoscience & nanotechnology010306 general physics0210 nano-technology01 natural sciencesAtomic and Molecular Physics and OpticsSynchrotron Radiation News
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Electronic structure of the spin-12quantum magnet TiOCl

2005

We have studied the electronic structure of the spin-$1∕2$ quantum magnet TiOCl by polarization-dependent momentum-resolved photoelectron spectroscopy. From that, we confirm the quasi-one-dimensional nature of the electronic structure along the crystallographic $b$ axis and find no evidence for sizable phonon-induced orbital fluctuations as the origin for the noncanonical phenomenology of the spin-Peierls transition in this compound. A comparison of the experimental data to our own $\mathrm{LDA}+\mathrm{U}$ and Hubbard model calculations reveals a striking lack of understanding regarding the quasi-one-dimensional electron dispersions in the normal state of this compound.

PhysicsX-ray photoelectron spectroscopyHubbard modelCondensed matter physicsMagnetCondensed Matter::Strongly Correlated ElectronsStrongly correlated materialElectronElectronic structureCondensed Matter PhysicsPhenomenology (particle physics)QuantumElectronic Optical and Magnetic MaterialsPhysical Review B
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Magnetometry of buried layers—Linear magnetic dichroism and spin detection in angular resolved hard X-ray photoelectron spectroscopy

2012

Abstract The electronic properties of buried magnetic nano-layers were studied using the linear magnetic dichroism in the angular distribution of photoemitted Fe, Co, and Mn 2p electrons from a CoFe–Ir78Mn22 multi-layered sample. The buried layers were probed using hard X-ray photoelectron spectroscopy, HAXPES, at the undulator beamline P09 of the 3rd generation storage ring PETRA III. The results demonstrate that this magnetometry technique can be used as a sensitive element specific probe for magnetic properties suitable for application to buried ferromagnetic and antiferromagnetic magnetic materials and multilayered spintronics devices. Using the same instrument, spin-resolved Fe 2p HAXP…

RadiationMaterials scienceSpintronicsMagnetometerAnalytical chemistryElectronUndulatorDichroismCondensed Matter PhysicsMolecular physicsAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic Materialslaw.inventionCondensed Matter::Materials ScienceX-ray photoelectron spectroscopyFerromagnetismlawAntiferromagnetismPhysical and Theoretical ChemistrySpectroscopyJournal of Electron Spectroscopy and Related Phenomena
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