Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 23: Spin Dynamics and Transport: Ultrafast Effect

MA 23.4: Vortrag

Dienstag, 21. März 2017, 10:15–10:30, HSZ 403

Ultrafast structural and magnetization dynamics of the Skyrmion crystal GaV4S8 — •Evgeniia Slivina1, Prashant Padmanabhan1, Rolf B. Versteeg1, Sándor Bordács2, István Kézsmárki2, and Paul H. M. van Loosdrecht11II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Germany — 2Department of Physics, Budapest University of Technology and Economics and MTA-BME Lendület Magneto-optical Spectroscopy Research Group, 1111 Budapest, Hungary

GaV4S8 is a lacunar spinel, notable for its unusual para-to-ferroelectric phase transition and the emergence of novel magnetic ground states below the Néel temperature. One of the latter - the Néel Skyrmion - was recently observed, but to date, little is known about the coherent control of magnetic excitations in this material. Here, we employ time-resolved magneto-optical Kerr effect spectroscopy to demonstrate the coherent excitation of Néel-type Skyrmions and other magnetic ground states in GaV4S8. In addition, we measure the time-resolved differential reflectivity and coherent phonon dynamics to elucidate the Jahn-teller induced para-to-ferroelectric phase transition in this material.

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