Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 11: Electron Theory of Magnetism and Correlations (joint session MA/TT)
MA 11.8: Vortrag
Montag, 9. März 2026, 17:00–17:15, POT/0151
Magnetic Persistence in PrAlGe via RIXS and XAS modeling — •Juan Felipe Pulgarin Mosquera1,2, Yun Yen3, Tianlun Yu4, Yeong-Ah Soh4, Thorsten Schmitt4, and Michael Schueler1,2 — 1PSI Center for Scientific Computing, Theory and Data, Villigen PSI, Switzerland — 2University of Fribourg, Department of Physics, University of Fribourg, Fribourg , Switzerland — 3Institute for Theoretical Physics and Bremen Center for Computational Materials Science, University of Bremen, Bremen, Germany — 4PSI Center for Photon Sciences, Villigen-PSI, Switzerland
The interplay between topological electronic states and magnetism is in the spotlight of condensed matter for potential applications. PrAlGe is a prime candidate in this context, with several works reporting it as a magnetic Weyl semimetal. However, the microscopic relationship between the magnetic ordering, anomalous Hall effect and local spectroscopic signatures remains an open question. We study this phenomenon based on a combination of X-ray spectroscopy and first-principle calculations. We present our ab-initio approach to computing X-ray absorption spectroscopy and resonant inelastic X-ray scattering based on accurate Anderson Impurity model derived from density-functional theory with Hubbard corrections. This comparison is crucial for understanding the experimental finding that the ferromagnetic transition occurs at Tc ∼ 16 K, significantly lower than the temperature scale at which the AHE and circular dichroism vanish TAHE ∼ 35 K). The survival of circular dichroism above Tc serves as a local probe for the persistence of local magnetic moments.
Keywords: Resonant inelastic X-ray spectroscopy (RIXS); X-ray absorption spectroscopy (XAS); Exact diagonalization; Ab-initio theory; Weyl semimetal