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The quasi two-dimensional antiferromagnetic compound TlCo2Se2 has been studied by 57Fe Mössbauer spectroscopy. Small single crystals have been made with 2% Fe doping. The Mössbauer spectrum, developed below the Néel temperature of 85 K, reveals a distribution of magnetic hyperfine fields (MHF). The fit is reasonably good if we suppose a connection between the values and mutual orientation of the EFG...
Small particles of iron oxides, nominally 7 nm and 13 nm in diameter, have been studied by 57 Fe Mössbauer spectroscopy in the temperature range 4 K to room temperature. The Mössbauer spectra show, at high temperature, relaxational behaviour in agreement with the superparamagnetism expected. At low temperature the spin motion becomes slower and, finally, blocked. There are also indications...
The quasi two-dimensional antiferromagnetic compound TlCo2Se2 has been studied by 57Fe Mössbauer spectroscopy. Small single crystals have been made with 2% Fe doping. The Mössbauer spectrum, developed below the Néel temperature of 85 K, reveals a distribution of magnetic hyperfine fields (MHF). The fit is reasonably good if we suppose a connection between the values and mutual orientation of the EFG...
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