Abstract
Sn 1− x Mn x Se 2 crystals have been grown by a modified Bridgman method aiming to form a new semimagnetic semiconductor whose particularity will be to have a layered CdI 2-type crystal structure. This paper reports the first detailed structural and photoemission study of this new material. X-ray diffraction analysis performed on two different samples showed that only one had the expected lattice symmetry, the other one being a mixture of SnSe and α-MnSe phases. Although the preparation method of these specimen was the same they differed by the manganese quantity inserted to substitute tin in the SnSe 2 lattice. This study also reveals that Mn-solubility into this lattice is not high. Photoelectron spectroscopy using X-ray and synchrotron radiation were also carried on. As it was expected, chemical states of tin and selenium in layered Sn 1− x Mn x Se 2 are Sn 4+ and Se 2−, respectively. Manganese is present as Mn 2+ ion, like it is the case in II 1 −x Mn x VI materials. Investigations of layered Sn 1− x Mn x Se 2 valence band revealed that the Mn 3d density of states is constituted of localized states at 3.5 eV of binding energy with delocalized states at lower and higher energy. Differences in Mn 3d density of states have been observed with respect to a biphased Sn 1− x Mn x Se 2 compound.
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