SrEr 2 O 4 is a geometrically frustrated magnet which demonstrates rather unusual properties at low temperatures including a coexistence of long-and short-range magnetic order, characterized by two different propagation vectors. In the present work, the effects of crystal fields (CFs) in this compound containing four magnetically inequivalent erbium sublattices are investigated experimentally and theoretically. We combine the measurements of the CF levels of the Er 3+ ions made on a powder sample of SrEr 2 O 4 using neutron spectroscopy with site-selective optical and electron paramagnetic resonance measurements performed on single-crystal samples of the lightly Er-doped nonmagnetic analog, SrY 2 O 4 . Two sets of CF parameters corresponding to the Er 3+ ions at the crystallographically inequivalent lattice sites are derived which fit all the available experimental data well, including the magnetization and dc susceptibility data for both lightly doped and concentrated samples.
We report the first observation of Rabi oscillations in the spin-7/2 ensemble of trivalent gadolinium ions hosted in CaWO4 single crystal. A number of transitions within the lowest electronic multiplet S of Gd 3+ ion are studied using a combination of continuous-wave and pulsed electron paramagnetic resonance spectroscopy. The corresponding Rabi damping curves and the spin coherence times are detected at varying strengths of the microwave field. These data are well reproduced by a theoretical model which accounts for the intrinsic inhomogeneity of the microwave field within the microwave resonator and the magnetic dipole interactions in the diluted spin ensemble. The results indicate that the studied 8-level ground manifold of Gd 3+ ion can represent an effective three-qubit quantum system.
Electron paramagnetic resonance (EPR) of |1o 3 § single ions and llo3'-Mg-"-vacancy-llo 3' associates in holmium-doped forsterite single crystals are studied at 9.4, 37.3 and 65-250 Gtlz. Crystals were grown from melt by the Czochralski technique in slightly oxidizing atmosphere. For both centers, directions of the principal magnetic axes and parameters of the effective spin Hamiltonians describing dependences of electron-nuclear levels on applied magnetic field are obtained. For [lo s' substituting Mg"" in the M2 site as the single ion and for Ho "~" ions in dimer centers, values of crystal field parameters related to a real crystal lattice structure are estimated in the framework of the exchange charge model. The calculated crystal field energies, values of the g-factors of the ground I-[o 3~ quasi-doublet and the directions of the corresponding magnetic moments agree satisfactorily with the data obtained from measurements of EPR and optical absorption and site-selective luminescence spectra. I IntroductionForsterite (Mg2SO4) is a member of family of olivines (Mg.~ej_x)2SiO 4, one of the widespread rock-forming minerals. Nowadays the interest to forsterite single crystals is related also with the efficient tunable laser oscillation of chromiumdoped forsterite, obtained to the moment in different regimes, including continious-wave oscillation [1, 2] and femtosecond pulse generation [3].A unir cell of forsterite crystalline structure (the lattice constants equal a = 0.4753, b = 1.019, c = 0.5988 nm) contains 4 formula units and has an orthorhombic symmetry with a space group Pbnm. The idealized olivine structure consists of a hexagonal close-packed array of oxygen anions, between which the octahedral and tetralaedral holes are located. One hall of those octahedral holes are occupied by Mg -'+ cations and 1/4 of tetrahedral holes are occupied
In this paper, new steps toward a better understanding and utilization of high-pressure high-temperature nanodiamonds (NDs) containing nitrogen-vacancy (NV) centers have been taken. NV − -related long-term luminescence of oxygenated particles increased in comparison to plasma hydrogenated NDs' NV − luminescence. The optically detected NV − electron spin resonance process can be also significantly affected by ND termination. For Hterminated ND particles the NV − to NV 0 conversion energy is lower than the NV − excitation energy, so that the delocalized triplet electrons can be more easily released from the original positions and drawn to the electron-attracting localities in the material. The final result of this study was application of luminescent NDs in cells, showing the detectability of luminescent NDs in a standard confocal microscope and ND subcellular distribution in the cells by TEM.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2025 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.