Magnetic properties of multiferroic K3Cr2Fe3F15
Perović, Marija M.
Dalal, N. S.
Scott, J. F.
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The local electronic and structural as well as the macroscopic magnetic properties of K3Cr2Fe3F15 have been studied between room temperature and 4 K. The system has been found to be isostructural with ferroelectric and weakly ferrimagnetic K3Fe5F15 above the ferroelectric transition temperature T-c. The X-band and 216 GHz Cr3+ electron paramagnetic resonance (EPR) spectra as well as the magnetic susceptibility and Moumlssbauer data show the existence of two magnetic relaxor type transitions around 37 and 17 K. The K-39 magic angle sample spinning NMR, EPR, and the Moumlssbauer data further demonstrate the existence of two nonequivalent Fe, Cr, and K sites in the unit cell as well as the presence of rapid exchange at higher temperatures. The observation of the Fe2+ EPR and Moumlssbauer spectra shows that the Fe2+ ion is in a high spin state.
Кључне речи:chromium compounds / electronic structure / ferroelectric transitions / ferromagnetic materials / iron compounds / lattice constants / magic angle spinning / magnetic susceptibility / Mossbauer effect / multiferroics / paramagnetic resonance / potassium compounds / relaxor ferroelectrics / space groups
Извор:Journal of Applied Physics, 2010, 107, 4
ISSN: 0021-8979 (print)