Abstract
A previous study of the spinel CuFe0.5Ti1.5S4 revealed partial crossover of Fe(II) from a high-spin state to a low-spin state with decreasing temperature and an antiferromagnetic ordering of the residual high-spin iron below 7 K. The present study uses the possibility to introduce a small amount of 119Sn into the spinel lattice as a substitute for titanium, leading to the compound CuFe0.5Ti1.4Sn0.1S4. This compound is analysed by 119Sn Mössbauer spectroscopy in the temperature range from 4 to 510 K. The temperature dependence of the 119Sn centre shift is discussed in terms of charge transfer between Fe and Sn induced by the spin crossover. The temperature dependence of the area under the 119Sn Mössbauer absorption lines is discussed in terms of changes of the vibrational lattice properties induced by the spin crossover and the magnetic ordering. Experimental proof of a spin crossover induced by the static magnetic field below the Néel temperature is provided.
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