Dresden 2017 – wissenschaftliches Programm
MA 47.5: Vortrag
Donnerstag, 23. März 2017, 10:30–10:45, HSZ 04
Relaxation dynamics between the modulated magnetic phases of GaV4S8 investigated by ac-susceptibility measurements — •Bertalan György Szigeti1, Ádám Butykai1, Sándor Bordács1,2, László Ferenc Kiss3, and István Kézsmárki1,2 — 1Department of Physics, Budapest University of Technology and Economics, Budafoki út 8., Budapest, Hungary — 2MTA-BME Lendület Magneto-optical Spectroscopy Research Group — 3Wigner Research Centre for Physics, Budapest, Hungary
GaV4S8 is a multiferroic semiconductor, known to be the first bulk material with a non-chiral crystal structure to host (Néel-type) magnetic skyrmions . Below its Curie-temperature, TC=13 K, the compound features cycloidal spin spirals, a skyrmion lattice phase and a uniform ferromagnetic phase in increasing magnetic fields. The field-induced phase transitions involve the rearrangement of large magnetic structures, therefore the magnetic relaxation occurs on enhanced, often macroscopically large timescales. Here, a systematic study of the frequency-dependent ac-susceptibility of the material is presented, also discussing the temperature dependence of the relaxation time at the phase boundaries.
 I. Kézsmárki et al., Nat. Mater.14, 1116 (2015)