title: Spectroscopic evidence of spinel phase clustering in solid solutions Hg(1-x)Cr(x)Se (0.03 ≤ x ≤ 0.1).
abstract: The diluted magnetic semiconductors Hg(1-x)Cr(x)Se (0.03≤x≤0.1) were prepared by the solid state recrystallization method. The structure microanalysis of the Hg(1-x)Cr(x)Se compounds, performed by using a scanning electron spectrometer, has shown that the HgCr(2)Se(4) spinel-like inclusions are present in the host matrix Hg(1-x)Cr(x)Se and their amount increases when the chromium content grows. ESR studies of Hg(1-x)Cr(x)Se samples were carried out in the temperature range 4.2-300 K. ESR spectra of the samples with different chromium contents demonstrate the same g-factors at room temperature and similar fine structure development with the temperature decrease. Numerical studies of g-factors, performed by the modified crystal field approach (MCFA), allowed us to reveal that Cr(2+)/Cr(3+) ions in the tetrahedral environment of the solid solution Hg(1-x)Cr(x)Se cannot lead to the ESR signal. The experimental g-factor is well reproduced by a numerical g-factor for Cr(3+) ions located in the octahedral environment, being specific for the HgCr(2)Se(4) spinel phase. The onset of the ESR fine structure is determined by the trigonal distortions of the (CrSe(6))(9-) octahedral cell. From our study it has been found that the spinel clusters are present in the Hg(1-x)Cr(x)Se solid solution even at low chromium content.
authors.affiliation: A A Galkin Donetsk Institute for Physics and Engineering of NASU, 83114, Donetsk, Ukraine.
authors.forename: K
authors.initials: K
authors.lastname: Lamonova
authors.forename: I
authors.initials: I
authors.lastname: Ivanchenko
authors.forename: S
authors.initials: S
authors.lastname: Orel
authors.forename: S
authors.initials: S
authors.lastname: Paranchich
authors.forename: V
authors.initials: V
authors.lastname: Tkach
authors.forename: E
authors.initials: E
authors.lastname: Zhitlukhina
authors.forename: N
authors.initials: N
authors.lastname: Popenko
authors.forename: Yu
authors.initials: Y
authors.lastname: Pashkevich