EPR Spectra of Sintered Cd1−xCrxTe Powdered Crystals with Various Cr Content

Abstract

In this paper, we show a simple method of producing ferromagnetic materials with a Curie temperature above room temperature. The electron paramagnetic resonance (EPR) spectra of Cd1−xCrxTe (0.002 < x < 0.08) were measured with a dependence on temperature (82 K < T < 381 K). Obtained EPR lines were fitted to a Lorentz-shaped curve. The temperature dependencies of the parameters of the EPR lines, such as the peak-to-peak linewidth (Hpp), the intensity (A), as well as the resonance field (Hr), were studied. Ferromagnetism was noticed in samples at high temperatures (near room temperature). For a sample with a nominal concentration of chrome of x = 0.05, a very strong intrinsic magnetic field is observed. The value of the effective gyromagnetic factor for this sample is ge = 30 at T = 240 K. An increase of chrome concentration above x = 0.05 reduces the ferromagnetic properties considerably. Analysis of the temperature dependencies of the integral intensity of EPR spectra was carried out using the Curie–Weiss law and the paramagnetic Curie temperature was obtained.

Photochromism and Photomagnetism in 1,4-bis(4,5-diphenyl-imidazolyl)benzene Chromophores: Water Assisted π-stacks for the Generation of Stable Free Radicals in Solid State

“…Such high g value with broad EPR-signal is the signature of strong radical activity, mostly observed in metal-oxides where redox-active metal centres placed in close proximity. [41][42][43] BDPI as a non-metallic system confirmed through XPS analysis (Figure S16), the broad signal is being appeared through the spin-spin interaction of the π-radical centres, those are in close proximity. Interestingly, BDPI-I' exhibit a totally different radical activity compared to its parent material.…”

Establishing carrier transport channels based on TiS bonds and enhancing the photocatalytic performance of MXene quantum dots–ZnIn2S4 for ammonia synthesis

“…When MXene QDs are combined with ZnIn 2 S 4 , the g value of the ESR signal is 2.005 and the fitted curve has a pure Lorentz shape with a linewidth of 9.9 G. The Lorentz line shape indicates that the electrons that generate the ESR signals are surrounded by nonmagnetic nuclei. Sulfur, which has strong electronegativity, is a nonmagnetic nucleus, and the electron paramagnetic response is caused by the enrichment of electrons around sulfur 55 . In MXene QDs–ZnIn 2 S 4 , MXene QDs are electron‐rich, and the electrons around sulfur mainly originate from MXene QDs.…”

“…Sulfur, which has strong electronegativity, is a nonmagnetic nucleus, and the electron paramagnetic response is caused by the enrichment of electrons around sulfur. 55 In MXene QDs-ZnIn 2 S 4 , MXene QDs are electron-rich, and the electrons around sulfur mainly originate from MXene QDs. This confirms the correctness of the inference given in the theoretical calculations: MXene QDs are anchored on the surface of ZnIn 2 S 4 through Ti S bonds and Ti S bonds are present inside MXene QDs.…”

Electron Paramagnetic Resonance Study of PbSe, PbTe, and PbTe:In Semiconductors Obtained by the Pulsed Laser Deposition Method

“…The most interesting effects related to the influence of electronic properties of semi-magnetic semiconductors on their magnetic behavior are observed in the IV–VI groups of semiconductors, such as PbSe or PbTe [ 25 , 26 , 27 , 28 , 29 ]. Interesting ferromagnetic properties have been observed in many diluted magnetic semiconductors (DMS), e.g., ZnTe + Mn [ 30 ] and CdTe + Cr [ 31 ]. In addition, interesting ferromagnetic properties have been studied in works [ 32 , 33 , 34 , 35 ] for the doping of the Cu ion in ZnO.…”