Kazan state Federal University E-Archive :: Browsing by Author "Rakhmatullin R."

A pulsed EPR study of clustering of Yb3+ ions incorporated in GeO2 glass

Sen S.; Rakhmatullin R.; Gubaydullin R.; Silakov A. (2004)

The structural aspects of clustering of Yb3+ ions and the paramagnetic behavior of these clusters have been investigated in GeO 2 glasses doped with 140-1100 ppm by weight of Yb2O 3 using time-domain electron paramagnetic ...

An improved coupling design for high-frequency TE011 electron paramagnetic resonance cavities

Savitsky A.; Grishin Y.; Rakhmatullin R.; Reijerse E.; Lubitz W. (2013)

In high-frequency electron paramagnetic resonance (EPR) spectroscopy the sample is usually accommodated in a single-mode cylindrical TE011 microwave cavity. This cavity stands out in terms of flexibility for various types ...

Application of Q-band electron spin echo spectrometer to investigation of glasses doped with rare earth ions

Gromov I.; Orlinskii S.; Rakhmatullin R. (1992)

The Q-band electron spin echo (ESE) spectrometer which was created using modern microwave components is described. This simple incoherent apparatus was used with the X-band one for the study of phosphate and silicate glasses ...

Coherence times and Rabi oscillations in CaWO4:Cr5+ crystal

Baibekov E.; Kurkin I.; Gafurov M.; Endeward B.; Rakhmatullin R.; Mamin G. (2011)

The coherence times of dopant pentavalent chromium ions in CaWO4 single crystal (0.0006 at.% Cr5+) were investigated both theoretically and experimentally. Temperature dependences of spin-lattice relaxation time T1 and ...

Coherent spin manipulations in Yb3+: CaWO4 at X - And W -band EPR frequencies

Rakhmatullin R.; Kurkin I.; Mamin G.; Orlinskii S.; Gafurov M.; Baibekov E.; Malkin B.; Gambarelli S.; Bertaina S.; Barbara B. (2009)

Coherent spin dynamics of impurity Yb3+ ions in the CaWO4 single crystal has been studied using X - and W -band EPR. Rabi oscillations of the sample magnetization with damping times comparable to their period, driven by ...

Dark magnetic resonance in an electron-nuclear spin system

Rakhmatullin R.; Hoffmann E.; Jeschke G.; Schweiger A. (1998)

Dark magnetic resonance in the solid state is observed and is shown to be analogous to electromagnetically induced transparency in coherent optics. The basis of the two effects is coherent population trapping, which can ...

Detection of quasi-periodic processes in repeated measurements: New approach for the fitting and clusterization of different data

Nigmatullin R.; Rakhmatullin R. (2014)

Many experimentalists were accustomed to think that any independent measurement forms a non-correlated measurement that depends weakly from others. We are trying to reconsider this conventional point of view and prove that ...

Direct spectroscopic observation of the atomic-scale mechanisms of clustering and homogenization of rare-earth dopant ions in vitreous silica

Sen S.; Rakhmatullin R.; Gubaidullin R.; Pöppl A. (2006)

Structural aspects of clustering of rare earth ions in oxide glasses have been studied for the last several years in relation to their applications in photonics. However, the mechanism of homogenization of the spatial ...

Electron paramagnetic resonance linewidth narrowing of Gd3+ ions in Y-doped ceria nanocrystals with decreasing crystallite size

Rakhmatullin R.; Aminov L.; Kurkin I.; Böttcher R.; Pöppl A.; Avila-Paredes H.; Kim S.; Sen S. (2009)

Electron paramagnetic resonance (EPR) spectra of Gd3+ ions in crystalline Ce1-x-y Gdx Yy O2- [0.5* (x+y)] (x=0.0025, y=0.10, and 0.25) with crystallite sizes ranging from 600 nm down to 5 nm have been measured at X -band ...

Electron spin-lattice relaxation of Yb3+ and Gd3+ ions in glasses

Vergnoux D.; Zinsou P.; Zaripov M.; Ablart G.; Pescia J.; Misra S.; Rakhmatullin R.; Orlinskii S. (1996)

The electron spin-lattice relaxation rate (T1 -1) was measured in two glass samples: (i) a phosphate glass doped with 1 wt% Yb2O3 and (ii) a Li2Si4O9 glass sample doped with 0.2 wt% Gd2O3. In the Yb3+-doped glass sample, ...

Enhanced Room-Temperature Ferromagnetism in Composite CeO<inf>2</inf>/CeF<inf>3</inf> Nanoparticles

Morozov O.; Pavlov V.; Rakhmatullin R.; Semashko V.; Korableva S. (2018)

© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim A considerable enhancement of the room-temperature ferromagnetism is observed in the composite CeO2/CeF3 nanoparticles. The saturation magnetization for the composite ...

EPR and spin-lattice relaxation of rare-earth ions in LiLuF4 monocrystals

Abdulsabirov R.; Antipin A.; Korableva S.; Rakhmatullin R.; Rozentsvaig Y. (1988)

The EPR and spin-lattice relaxation are studied of impurity rare-earth ions in LiLuF4 crystals at liquid-helium temperatures. It is detected that paramagnetic relaxation of Er3+ ions is retarded by the effect of the phonon ...

EPR Evidence of Unusual Dopant Valency States in Nanocrystalline Er-doped CeO<inf>2</inf>

Rakhmatullin R.; Aminov L.; Kurkin I.; Pöppl A. (2015)

© 2015, Springer-Verlag Wien. The structure and oxidation state of the Er dopant cation in CeO<inf>2</inf> single crystal and nanocrystals with size ranging from 22 to 300 nm are studied using electron paramagnetic resonance ...

EPR of Gd3+ ion in mixed CeO2-Y2O3 nanocrystals

Aminov L.; Kurkin I.; Rakhmatullin R.; Böttcher R.; Pöppl A.; Sen S. (2009)

This paper reports on the results of EPR studies of mixed CeO2-Y2O3 crystals (including nano-sized crystals) doped by gadolinium ions. It is revealed that the width of the line corresponding to the allowed transition 1/2 ...

EPR of Yb3+ ions in Ba1-xLaxF 2+x mixed crystals

Aminov L.; Abdulsabirov R.; Gafurov M.; Korableva S.; Kurkin I.; Kurzin S.; Rakhmatullin R.; Ziganshin A. (2005)

Electron paramagnetic resonance (EPR) spectra of impurity Yb3+ ions (about 0.1 at.%) in mixed crystals BaF2(1 - x) plus LaF 3(x;) have been investigated for different values of the concentration x at a frequency of about ...

EPR studies of cerium dioxide nanoparticles

Shukla A.; Rakhmatullin R. (2017)

© Springer (India) Pvt. Ltd. 2017.This chapter intends to provide a review of EPR spectroscopic characterization of ceria nanoparticles. It covers recent EPR applications to investigate the synthesis, local structure, and ...

EPR study of ceria nanoparticles containing different concentration of Ce<sup>3+</sup> ions

Rakhmatullin R.; Semashko V.; Korableva S.; Kiiamov A.; Rodionov A.; Tschaggelar R.; van Bokhoven J.; Paun C. (2018)

© 2018 Elsevier B.V. The electron paramagnetic resonance of Ce3+ ions in ceria is a rather controversial issue. In this report we analyze the EPR line with g ∼1.97 in the absorption spectra of ceria powders, which has been ...

EPR study of fluorite containing different concentration of ceria

Aminov L.; Kurkin I.; Lovchev A.; Rakhmatullin R.; Rodionov A.; Korableva S. (2020)

© 2019 Elsevier B.V. The variation of EPR spectra has been investigated in CaF2 single crystals doped with ceria depending on the content of CeO2 and methods of the crystal growth. The concentration of CeO2 changed from ...

EPR study of nanocrystalline CeO<inf>2</inf> exhibiting ferromagnetism at room temperature

Rakhmatullin R.; Pavlov V.; Semashko V. (2016)

© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.Electron paramagnetic resonance (EPR) spectroscopy complemented with X-ray diffraction, X-ray fluorescence, and optical spectroscopy was used to study nanocrystalline CeO2 ...

EPR, optical, and dielectric spectroscopy of Er-doped cerium dioxide nanoparticles

Rakhmatullin R.; Kurkin I.; Pavlov V.; Semashko V. (2014)

Abstractauthoren Abstractauthoren The cerium dioxide nanoparticles doped at low level with Er ions and with grain sizes of about 22 and 300nm were comprehensively studied using EPR, optical and microwave dielectric ...

Browsing by Author "Rakhmatullin R."

Browsing by Author "Rakhmatullin R."

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