Superhyperfine interactions in Ce3+ doped LiYF4 crystal: ENDOR measurements

The first observation of the resolved Mims electron-nuclear double resonance (ENDOR) spectra from the nearby and remote nuclei of 19F and 7Li nuclei on impurity Ce3+ ions in LiYF4 crystal is reported. It shows that LiYF4:Ce3+ system can be exploited as a convenient matrix for performing spin manipulations and adjusting quantum computation protocols while ENDOR technique could be used for the investigation of electron-nuclear interaction with all the nuclei of the system and exploited for the electron-nuclear spin manipulations.Comment: 4 pages, 2 figures, 1 Table. Reported on Theor-2017 (Kazan, Russia) Conferenc

The relaxing Tl2+ defects in crystals of β-K2SO4 group

EPR of Tl2+ ions in K2SO4, Rb2SO4, Cs2SO4 crystals have been studied. Noncentrality of Tl2+ (II) ions was observed. Activation energy values of Tl(II) complexes motion were obtained. Anomalous temperature dependence of EPR line position and appearance of new EPR lines in Rb2SO4, Cs2SO4 crystals were observed

The lifetime distribution of Tl2+ defect configurations in K2SO4 crystals

The coexistenceof EPR lines corresponding to ranges of fast and slow motion of relaxing Tl2+ defects in K2SO4 crystals was observed. The coexistence was determined to come from the lifetime distribution of Tl2+ low symmetry defect configurations. The shape of the distribution was fixed

Single-Spin Measurement and Decoherence in Magnetic Resonance Force Microscopy

We consider a simple version of a cyclic adiabatic inversion (CAI) technique in magnetic resonance force microscopy (MRFM). We study the problem: What component of the spin is measured in the CAI MRFM? We show that the non-destructive detection of the cantilever vibrations provides a measurement of the spin component along the effective magnetic field. This result is based on numerical simulations of the Hamiltonian dynamics (the Schrodinger equation) and the numerical solution of the master equation.Comment: 5 pages + 5 figures (PNG format

Identification of Fe3+-Li+ complexes in ZnO by means of high-frequency EPR/ENDOR spectroscopy

Theoretical prediction of a high Curie temperature in ZnO doped with Mn, Fe, and other transition metals has stimulated the investigation of these materials by many research groups. Although charge-compensated Fe3+ centers in ZnO:Fe have been observed by means of EPR and have been known for decades, conclusions on the chemical nature of these defects are still contradictory. Originally, these centers were treated as Fe3+-Li + complexes with both ions occupying adjacent cationic sites. Recently, however, the centers were interpreted as a substitutional Fe 3+ ion with a vacancy at an adjacent zinc or oxygen site (Fe-V Zn or Fe-VO). In order to determine the chemical nature of the impurity associated with Fe3+, electron-nuclear double resonance (ENDOR) spectroscopy was used. ENDOR measurements reveal NMR transitions corresponding to nuclei with g-factor gN = 2.171 and spin I = 3/2. This unambiguously shows presence of Li as a charge compensator and also resolves contradictions with the theoretical prediction of the Fe-VO formation energy. The electric field gradients at the 7Li nuclei (within the Fe3+-Li+ complexes) were estimated to be significantly lower than the gradient at undistorted Zn sites. © 2013 Elsevier Inc. All rights reserved

High-frequency pulsed ENDOR spectroscopy of the NV- centre in the commercial HPHT diamond

© 2015 Elsevier Inc. All rights reserved. This work reports direct 94 GHz ENDOR spectroscopy of the 14N nuclei in the NV- centre in single-crystal diamond. Roadmaps of ENDOR frequencies were measured and hyperfine/quadrupole interaction parameters were obtained, with AX,Y = -2.7 MHz, AZ = -2.2 MHz and P = -4.8 MHz. The sign and value of each parameter was calculated using spin Hamiltonian matrix diagonalization, first and second order perturbation theory and confirmed experimentally. Magnetic field magnitude was measured by 13C ENDOR signal with 0.02% precision or 0.5 mT. The orientation of quadrupole, hyperfine and fine structure tensors are the same within error of experiment, g-factor is isotropic

Transient Dynamics in Magnetic Force Microscopy for a Single-Spin Measurement

We analyze a single-spin measurement using a transient process in magnetic force microscopy (MFM) which could increase the maximum operating temperature by a factor of Q (the quality factor of the cantilever) in comparison with the static Stern-Gerlach effect. We obtain an exact solution of the master equation, which confirms this result. We also discuss the conditions required to create a macroscopic Schrodinger cat state in the cantilever.Comment: 22 pages 2 figure

Rural investment climate and business activities of agro-enterprise: Evidence from northern area of Vietnam

2013東京農業大