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Spin-glass behavior of warwickite MgFeBO4 and CoFeBO4 crystals observed by Mössbauer spectroscopy

AutorLyubutin, I. S.; Kazak, N. V.; Ovchinnikov, S.; Arauzo, Ana B.; Bartolomé, Juan
Palabras claveWarwickites
Mössbauer spectroscopy
Fecha de publicación2015
CitaciónJournal of Alloys and Compounds 642: 204-209 (2015)
ResumenSingle crystals of MgFeBO4 and СоFeBO4 warwickites were obtained. The effects of charge ordering and magnetic properties were investigated by Mössbauer spectroscopy. Cation distribution over M1 and M2 nonequivalent sites and the average charge at the metal positions were established. Low temperature Mössbauer spectra reveal spin-glass behavior, with spin-freezing temperatures TSG of 15.2 and 33.2 K for Mg- and Co-warwickites, respectively, higher than that observed from the d.c. and a.c. magnetic susceptibility measurements. The difference is explained in terms of dynamical scaling theory. The specific shape of the Mössbauer spectra in the vicinity of the magnetic transition at TSG shows the difference between spin-glass and superparamagnetic behavior and demonstrates an overwhelming role of the exchange anisotropy in the properties of Mg-warwickite. In Co-warwickite the increase of magnetocrystalline anisotropy provokes an increase in magnetic viscosity.
Identificadoresdoi: 10.1016/j.jallcom.2015.04.067
issn: 0925-8388
e-issn: 1873-4669
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