Magnetic Properties of Thalium Chromium Chalcogenides
The magnetic properties of TlCrX2 (X = S, Se, Te), Tl3CrS3, TlCr3S5, TlCr3Se5 and TlCr5Se5 have been investigated. TlCrS2, TlCrSe2 and Tl3CrS3 order ferromagnetically with Curie temperatures in the range 60–140 K. The other compounds are antiferromagnetics with negative paramagnetic Curie temperatures, whereas TlCrTe2 has a positive paramagnetic Curie temperature. TlCrS2 and TlCrSe2 have a hexagonal layer structure with Cr ions sandwiched between S and Se-layers which in turn are separated by the large radius Tl-layers. The shorter Cr-Cr distance in the haxagonal planes gives rise to a stronger intralayer exchange interaction and therefore to a behaviour analogous to that of a quasi-twodimensional magnet. TlCrS2 and TlCrSe2 seem to represent the extremal case in the range of ACrX2 chalcogenides with A = Cu, Ag, Na, Li, K, where with the increase of the lattice constant a in the hexagonal plane a trend towards stronger positive exchange interactions has been observed.
KeywordsMagnetic Property Curie Temperature Magnetization Curve Bohr Magneton Indirect Exchange
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