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

doi:10.1103/physrevb.52.1290

Cited by 38 publications

(49 citation statements)

References 23 publications

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“…This kind of behavior has been studied analytically and with computer simulations for simple spin systems [13,14]. For dilute systems of electron spins, it has been demonstrated that the homogeneous width of spin packets can be significantly smaller than the statistical dipolar linewidth [15]. Our recent experiments show that 1 H NMR peaks three orders of magnitude narrower than the dipolar width can be observed with weak excitation [1 -5].…”

Section: Introductionmentioning

confidence: 99%

Coherent Response Signals of Dipolar-coupled Spin Systems

Fung¹,

Ermakov²,

Khitrin

2004

Zeitschrift Für Naturforschung A

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Recently, it has been demonstrated that long pulses of a weak radio-frequency field can generate long-lived coherent NMR signals in bulk liquid crystals, which are systems of dipolar-coupled spins with unresolved conventional spectra. Here we describe this phenomenon in more detail and present results of new experimental investigations and computer simulations. It is shown that such response signals can also be excited when the initial spin state of a system corresponds to dipolar ordering. In addition, results of the application of weak pulses on liquid crystalline systems with heteronuclear dipolar couplings are presented, and the role of overlapping peaks is explored.

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Section: Introductionmentioning

confidence: 99%

Coherent Response Signals of Dipolar-coupled Spin Systems

Fung¹,

Ermakov²,

Khitrin

2004

Zeitschrift Für Naturforschung A

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“…The longitudinal relaxation time T 1 corresponding to the observed EMR spectrum was measured by the modulated technique with longitudinal detection [21]. The value of T 1 = (10±3) ns was obtained for the concentrated samples in the temperature range of 77-300 K.…”

Section: : -Ch2ch2ch2n + (C10h21)2(ch3) a -: R-(och2ch2)7o(ch2)3so3 -mentioning

confidence: 99%

“…The longitudinal relaxation time (T 1 ) was measured by modulation technique using a home-made apparatus with detection of longitudinal magnetization component oscillating at modulation frequency 1.6 MHz [21]. Both the "phase"…”

Section: : -Ch2ch2ch2n + (C10h21)2(ch3) a -: R-(och2ch2)7o(ch2)3so3 -mentioning

confidence: 99%

Magnetic resonance in nanoparticles: between ferro- and paramagnetism

Ногинова

Chen

Weaver

et al. 2007

J. Phys.: Condens. Matter

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Magnetic nanoparticles of γ-Fe 2 O 3 coated by organic molecules and suspended in liquid and solid matrices, as well as a non-diluted magnetic fluid have been studied by electron magnetic resonance (EMR) at 77-380 K. Slightly asymmetric spectra observed at room temperature become much broader, symmetric, and shift to lower fields upon cooling. An The shift and broadening of the spectrum upon cooling are ascribed to the role of the surface layer, which is considered with taking into account the strong surface-related anisotropy. To describe the overall spectrum shape, a "quantization" model is used which includes summation of the resonances corresponding to various orientations of the particle's magnetic moment at a given temperature. This approach, supplemented with some phenomenological assumptions, provides satisfactory agreement with the experimental data.

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“…On the other hand, LOD-ESR has been successful in determining T 1 in this compound [18,19]. The full method of obtaining T 1 data from the raw LOD-ESR data was reported previously [19] and is only outlined here.…”

Section: Performance Of the Spectrometermentioning

confidence: 99%

“…The full method of obtaining T 1 data from the raw LOD-ESR data was reported previously [19] and is only outlined here. In the simplest case [16,18] when Ω · T 1 < 1, the ratio of the in (u) and out-of phase (v) components of the oscillating longitudinal magnetization gives:…”

Section: Performance Of the Spectrometermentioning

confidence: 99%

ESR spectrometer with a loop-gap resonator for cw and time resolved studies in a superconducting magnet

Simón

Murányi

2005

Journal of Magnetic Resonance

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The design and performance of an electron spin resonance spectrometer operating at 3 and 9 GHz microwave frequencies combined with a 9 T superconducting magnet is described. The probehead contains a compact two-loop, one gap resonator and is embedded in the variable temperature insert of the magnet enabling measurements in the 0-9 T magnetic field and 1.5-400 K temperature range. The spectrometer allows studies on systems where resonance occurs at fields far above the g ≈ 2 paramagnetic condition such as in strongly interacting spin systems. The low quality factor of the resonator allows time resolved experiments such as e.g. longitudinally detected ESR. We demonstrate the performance of the spectrometer on the MgB2 superconductor and the RbC60 conducting alkaline fulleride polymer.

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Electron-spin-lattice relaxation inGdBa2Cu3

Cited by 38 publications

References 23 publications

Coherent Response Signals of Dipolar-coupled Spin Systems

Coherent Response Signals of Dipolar-coupled Spin Systems

Magnetic resonance in nanoparticles: between ferro- and paramagnetism

ESR spectrometer with a loop-gap resonator for cw and time resolved studies in a superconducting magnet

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