11th Joint Mmm-Intermag Conference, Washington, DC (USA) (18?22 January 2010):
Journal of Applied Physics, 01 May 2010, Vol.107(9)
Local-probe weak-transverse-field and zero-field μ SR measurements have been employed to investigate magnetic ordering in the new magnetoelectric compound FeTe 2 O 5 Br . Below the Néel transition temperature T N = 10.6 K a static local magnetic field starts to develop at the μ + sites. Fast μ + polarization decay below T N speaks in favor of a broad distribution of internal magnetic fields, in agreement with the incommensurate magnetic structure suggested by neutron diffraction experiments. Above T N the presence of short-range order is detected as high as at 2 T N , which suggests only weak interlayer magnetic coupling. On the other hand, strong Fe 3 + spin fluctuations likely reflect geometrically frustrated structure of [ Fe 4 O 16 ] 20 − spin clusters, which are the main building blocks of the layered FeTe 2 O 5 Br structure.
Proceedings Of The 11th Joint Mmm-Intermag Conference, Washington, DC, 2010