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Lattice and magnetic effects on a d-d excitation in NiO using a 25 meV resolution X-ray spectrometer

We investigate the behavior of a d-d transition in NiO using a new x-ray spectrometer with 0.025 eV resolution at 15816 eV, and via ab-initio ligand field theory calculations. The transition at ∼1.7 eV energy transfer is measured at temperatures between 20 and 800 K, at a momentum transfer |Q| = 6.5...

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Hauptverfasser: Ishikawa, Daisuke (VerfasserIn) , Haverkort, Maurits W. (VerfasserIn) , Baron, Alfred Q. R. (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: August 31, 2017
In: Journal of the Physical Society of Japan
Year: 2017, Jahrgang: 86, Heft: 9
ISSN:1347-4073
DOI:10.7566/JPSJ.86.093706
Online-Zugang:Verlag, Volltext: http://dx.doi.org/10.7566/JPSJ.86.093706
Verlag, Volltext: http://journals.jps.jp/doi/10.7566/JPSJ.86.093706
Volltext
Verfasserangaben:Daisuke Ishikawa, Maurits W. Haverkort, and Alfred Q.R. Baron
Beschreibung
Zusammenfassung:We investigate the behavior of a d-d transition in NiO using a new x-ray spectrometer with 0.025 eV resolution at 15816 eV, and via ab-initio ligand field theory calculations. The transition at ∼1.7 eV energy transfer is measured at temperatures between 20 and 800 K, at a momentum transfer |Q| = 6.52 Å−1. Fine structure is clearly observed at 20 K. As temperature is increased, the excitation shifts to lower energy and broadens. We explain the energy shift as being related to thermal expansion and to magnetism. The broadening is well fit considering thermal fluctuations of the Ni-O bond length, with a scale factor found to be in reasonable agreement with calculation.
Beschreibung:"d-d" im Titel ist kursiv
Gesehen am 03.11.2017
Beschreibung:Online Resource
ISSN:1347-4073
DOI:10.7566/JPSJ.86.093706

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