The Magnetic Pair Distribution Function Grows Up : Recent Developments in mPDF Analysis
Lundi 25 mars 2019 10:30
- Duree : 1 heure
Lieu : ILL 4, Seminar Room (no 163), 71 avenue des Martyrs - Grenoble
Orateur : Benjamin FRANDSEN (Brigham Young University - Provo, Utah - USA)
Quantitative analysis of diffuse magnetic scattering to investigate short-range magnetic correlations has historically been a challenging undertaking. Recently, magnetic pair distribution function (mPDF) analysis has emerged as a promising means to address this challenge. In analogy to the more familiar atomic PDF method, the mPDF is obtained from the Fourier transform of the magnetic total scattering cross section, yielding a map of local magnetic correlations directly in real space. This provides an intuitive way to investigate short-range magnetism and lends itself well to quantitative refinement of models of local magnetic structure. Here, I will present recent examples of mPDF analysis that highlight its unique scientific value, including investigations of the short-range-ordered magnetic ground state of the geometrically frustrated antiferromagnetic NaCaCo2F7 and the unusual magnetostructural phase transition in NaMnO2. Further, I will briefly introduce the free and open-source software package diffpy.mpdf that has been developed to aid in mPDF analysis. Taken together, the recent advancements in the mPDF technique demonstrate that it is maturing into a valuable addition to the experimental toolbox for studying complex magnetic materials.
Contact : dubouloz@ill.fr
Discipline évènement : (Physique)
Entité organisatrice : (ILL)
Nature évènement : (Séminaire)
Evènement répétitif : (General ILL seminar - College Vb)
Site de l'évènement : Polygone scientifique
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