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

• Verfasst von: Ishikawa, Daisuke [VerfasserIn]
• Verfasst von: Haverkort, Maurits W. [VerfasserIn]
• Verfasst von: Baron, Alfred Q. R. [VerfasserIn]
• Titel: Lattice and magnetic effects on a d-d excitation in NiO using a 25 meV resolution X-ray spectrometer
• Verf.angabe: Daisuke Ishikawa, Maurits W. Haverkort, and Alfred Q.R. Baron
• Fussnoten: "d-d" im Titel ist kursiv ; Gesehen am 03.11.2017
• Titel Quelle: Enthalten in: Nihon-Butsuri-Gakkai: Journal of the Physical Society of Japan
• Jahr Quelle: 2017
• Band/Heft Quelle: 86(2017,9) Artikel-Nummer 093706, 4 Seiten
• ISSN Quelle: 1347-4073
• DOI: doi:10.7566/JPSJ.86.093706
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1564991121

Abstract

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.