Influence of Mn concentration on the physical phenomena in the semimagnetic semiconductor Hg1−x−yCrxMnySe

Abstract

Results are presented from a study of the magnetic susceptibility and electron spin resonance (ESR) on Cr3+ and Mn2+ ions in a series of samples of the semimagnetic semiconductor Hg1−x−yCrxMnySe with x=0.02 and 0.01⩽y⩽0.08. The experimental results show that the structure of the ESR spectrum and the character of its shift with respect to magnetic field as the temperature changes depend on the ratio of the concentrations of chromium and manganese ions, which form two interacting substructures. The observed transition of Hg1−x−yCrxMnySe to a spin glass phase is not related to the distortion of the symmetry of the crystal lattice. The shared and distinctive properties of the systems Hg1−xCrxSe and Hg1−x−yCrxMnySe are determined.

Effect of structural and compositional inhomogeneities on spin-glass transition in Hg1−x−yCrxMnySe crystals

“…Lately, spin-glass transitions have been surprisingly observed at considerably higher temperatures (above 100 K) in several Se-based DMS of the type II 1Àx M x VI such as Hg 1Àx Cr x Se and Hg 1ÀxÀy Cr x Mn y Se [10,11]. It should be noted that the high temperature spin-glass transitions have been also reported for other Se-based materials, for example FeIn x Cr 2Àx Se 4 [12].…”

“…Our previous studies of the Hg 1Àx Cr x Se and Hg 1ÀxÀy Cr x Mn y Se crystals have shown that the later exhibits spin-glass transitions at higher temperatures, reaching the maximum value of T g and the strongest change of the magnetic susceptibility wðTÞ in the crystal composition range of x; yE0:0120:08 which is limited by the solubility of magnetic constituents in HgSe host [10,11]. In present letter, we try to explore the reason of this phenomenon by studying the magnetic susceptibility of Hg 1ÀxÀy Cr x Mn y Se crystals in dependence on their structural and compositional inhomogeneities.…”