Abstract
The results of a 57Fe Mössbauer spectroscopy study between 4.5 and 523.2 K and in external magnetic fields (up to 90 kOe) of semiconducting Tl0.53K0.47Fe1.64Se2 single crystals are reported. Evidence is provided for a possible phase separation into the magnetic majority and minority phases. It is demonstrated that the magnetic moments of the divalent Fe atoms located at the 16i site (space group I4/m) of the majority phase and of the minority phase are antiferromagnetically ordered, with the Néel temperature TN = 518.0(3.6) K. The magnetic moments at 5.0 K of 2.09(1) and 2.28(2) μB in these two phases are tilted from the crystallographic c axis by 18(1)∘ and 32(2)∘, respectively. The Debye temperature of Tl0.53K0.47Fe1.64Se2 is found to be 228(4) K.
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