Dresden 2026 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 3: Complex Magnetic Oxides

MA 3.9: Vortrag

Montag, 9. März 2026, 11:45–12:00, POT/0112

Probing Spin-Waves and Spin-Phonon Coupling in a Double Perovskite Oxide: A Raman Study — •Akriti Singh and Surajit Saha — Indian Institute of Science Education and Research Bhopal, Bhopal, India

Double perovskites have emerged as a promising class of materials to explore the novel magnetic phenomena. This includes high-TC magnetic orderings, spin-reorientation, magnetostriction, and multiferroicity due to the presence of complex spin arrangements, competing exchange pathways or magneto-elastic couplings. Here, we report the evolution of magnetic excitations in Ca2NiWO6 using inelastic light scattering and explore the complex interplay between the lattice and spin degrees of freedom. To get insights into the underlying magnetic dynamics, we performed temperature-dependent magnetization, x-ray diffraction, and Raman spectroscopic measurements. Our results indicate an antiferromagnetic ground state below 50 K along with signatures of magnetostriction and spin-phonon coupling. Additionally, we employ magneto-Raman spectroscopy to probe the low-energy spin-waves (magnons), providing evidence of the nature and origin of magnetism in the system. Taken together, our findings on Ca2NiWO6 highlight its potential as a fertile ground to study the complex magnetic phenomena arising due to its exchange interactions, suggesting that it may be a possible candidate for applications in spintronics, magnonics, and other advanced spin-based technologies.

Keywords: Raman spectroscopy; Spin-Phonon Coupling; Spin-Waves; X-Ray Diffraction; Double Perovskite