Metal-insulator transition in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">RbC</mml:mi></mml:mrow><mml:mrow><mml:mn>60</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>polymer fulleride studied by ESR and electron-spin relaxation

Ацаркин, В. А.; Демидов, В. В.; Vasneva, G. A.

doi:10.1103/physrevb.56.9448

Cited by 40 publications

(45 citation statements)

References 22 publications

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“…Mathematical expressions for the temperature dependence of spin-lattice relaxation are taken from the following references: Raman process (29,30), local mode (5), Orbach process (31), and thermally activated process (32).…”

Section: Experimental Methodsmentioning

confidence: 99%

Electron Spin Lattice Relaxation Rates for S = 12 Molecular Species in Glassy Matrices or Magnetically Dilute Solids at Temperatures between 10 and 300 K

Zhou

Bowler

Eaton

et al. 1999

Journal of Magnetic Resonance

125

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Section: Experimental Methodsmentioning

confidence: 99%

Electron Spin Lattice Relaxation Rates for S = 12 Molecular Species in Glassy Matrices or Magnetically Dilute Solids at Temperatures between 10 and 300 K

Zhou

Bowler

Eaton

et al. 1999

Journal of Magnetic Resonance

125

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“…Mathematical expressions for the temperature dependence of spin-lattice relaxation are taken from the following references: Raman process [15,16], local mode [17], Orbach process [18], and thermally activated process [19].…”

Section: Methodsmentioning

confidence: 99%

Frequency dependence of electron spin relaxation for threeS = 1/2 species doped into diamagnetic solid hosts

et al. 2001

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Electron spin lattice relaxation rates (1/T1 ) were measured as a function of temperature at two or three microwave frequencies for three S = 1/2 species in temperature ranges with different dominant relaxation processes. Between 10 and 50 K the contribution from the direct process to the relaxation rate was substantially greater at 94 than at 9.5 GHz for a vanadyl porphyrin doped into zinc tetratolylporphyrin. For bis(diethyldithiocarbamato)copper(TI) doped into the diamagnetic Ni(II) analog the relaxation rate between 25 and 100 K is dominated by the Raman process and exhibits little frequency dependence between 9.2 and 94 GHz. For 4-hydroxy-2,2,6,6-tetramethylpiperidinoloxy (tempol) doped into a diamagnetic host the relaxation rate between about 40 and 100 K is dominated by the Raman process. In this temperature range, relaxation rates at 3.2, 9.2, and 94 GHz exhibit little frequency dependence. Above about 130 K, the relaxation rate for tempol decreases in the order S-band > X-band > W-band. The relaxation rates in this temperature range fit a model in which ]IT, is dominated by a thermally activated process that is assigned as rotation of the methyl groups on the nitroxyl ring.

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“…8. If 'to is due to a thermally-activated process, then spectral density functions can describe the contribution to the relaxation, as proposed by Atsarkin et al (1997). Also, in the regime where a glass is softening it may be appropriate to describe the increased importance of molecular rotations by a thermally-activated 'te and a spectral density function.…”

Section: Spectral Density Functionsmentioning

confidence: 98%

Relaxation Times of Organic Radicals and Transition Metal Ions

Eaton

2002

Distance Measurements in Biological Systems by EPR

152

165

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Abstract:Review of electron spin relaxation times for organic radicals and transition metal ions in magnetically dilute samples. Emphasis is placed on studies that have been performed as a function of temperature and that provide insight into the relaxation processes. INTRODUCTION Scope of this ChapterMost of the methods for determining distances between spins (ch.l) are either experimentally feasible or theoretically applicable for a limited range of electron spin relaxation times. For example, analysis of the dipolar contribution to the CW line shape to determine interspin distance requires that the relaxation rate for the interacting partner is slow enough that the dipolar splitting is not collapsed by electron spin relaxation. In addition, analysis of the line shapes assumes that spectra are obtained under nonsaturating conditions and are free from passage effects. Application of methods based on changes in relaxation times requires that the relaxation rate of the interacting partner fall within certain limits. The longest distance that can be obtained by pulsed techniques is limited, in principle, by the relaxation-determined width of an individual spin packet. Thus, knowledge of electron spin relaxation times is foundational to the methodologies presented in this book.

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Metal-insulator transition inRbC60polymer fulleride studied by ESR and electron-spin relaxation

Cited by 40 publications

References 22 publications

Electron Spin Lattice Relaxation Rates for S = 12 Molecular Species in Glassy Matrices or Magnetically Dilute Solids at Temperatures between 10 and 300 K

Electron Spin Lattice Relaxation Rates for S = 12 Molecular Species in Glassy Matrices or Magnetically Dilute Solids at Temperatures between 10 and 300 K

Frequency dependence of electron spin relaxation for threeS = 1/2 species doped into diamagnetic solid hosts

Relaxation Times of Organic Radicals and Transition Metal Ions

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