Nuclear relaxation and NMR saturation in a crystal with a magnetic impurity

Buishvili, L. L.; Khutsishvili, G. R.; Zviadadze, M. D.

doi:10.1002/pssb.2220480245

Cited by 6 publications

(4 citation statements)

References 10 publications

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“…The spin-temperature theory of cross-relaxation was also developed by Provotorov in 1962 [38]. Later, this approach was applied to spectral diffusion (cross-relaxation between spin packets) within the inhomogeneously broadened EPR line [39,40]. It was shown that the effective spectral diffusion leads to the merging of the SS reservoir with the ''difference'' parts of Zeeman subsystems of the spin packets.…”

Section: Ssmentioning

confidence: 99%

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Dynamic Nuclear Polarization in Solids: The Birth and Development of the Many-Particle Concept

Ацаркин

Kessenikh

2012

Appl Magn Reson

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A brief review is presented on historical aspects of the dynamic nuclear polarization (DNP) research in 1960-1970s of the last century. Much attention is given to development of the many-particle approach, from pioneering studies of the 3-spin electron-nuclear cross effect to development of spin-temperature concept and thermal mixing mechanism of DNP in solids. Applicability of different models to modern DNP data is briefly discussed.This brief review is focused primarily on historical aspects: we will try to recollect the atmosphere of research in the fields of dynamic nuclear polarization (DNP) and solid-state spin dynamics, typical for the 1960s and 1970s of the last century. The paper does not claim to be exhaustive; in particular, the original references are often replaced by books and reviews. Much attention is given to studies performed in the Soviet Union; some of them are little-known because of the former Iron Curtain and the language barrier (the publications were in Russian). We hope to improve this situation and apologize in advance for a possible bias.At that time, the DNP technique was already well known and successfully applied, mostly in polarized proton targets. The physical interpretation of the DNP in non-conducting solids was restricted to the simplest two-particle picture including an electron spin S i of paramagnetic impurity coupled with a nuclear spin I j of the host lattice by magnetic dipole-dipole interaction. Following the ''solid effect'' (SE) mechanism suggested by Abragam and Proctor [1] (see also the

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Section: Ssmentioning

confidence: 99%

“…The total Zeeman energy is conserved due to Eq. (2), and the probability of this process, as determined by corresponding matrix elements and correlation functions [22,23], may be high enough. An elementary act of the ENCE is illustrated in Fig.…”

mentioning

confidence: 98%

Dynamic Nuclear Polarization in Solids: The Birth and Development of the Many-Particle Concept

Ацаркин

Kessenikh

2012

Appl Magn Reson

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“…This results in a single spin temperature of nuclei. Equation (21) differs from where Pd is determined qualitatively as in [13]. Here l / k is the frequency distance over which the spin excitation is transferred during TSL due to the spectral diffusion.…”

Section: + S N a P ( Q S -M N )mentioning

confidence: 98%

Relaxation and Nuclear Dynamic Polarization in the Case of Inhomogeneous EPR Broadening

Buishvili

Zviadadze

Fokina

1972

Physica Status Solidi (b)

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The time of nuclear relaxation and the amplification coefficient of polarization in diluted paramagnetic crystals with inhomogeneous broadening of EPR and with allowance for nuclear spin diffusion are calculated in various limiting cases. B~I~H C J I H~T C E IBpeMFi penaRcaqny1 ki K O~@ @ . H U . H~H T yckineHm non~1prn3as~rn Hnep B pa36aBJIeHHbIX IIapaMarHmTHbIX KpElCTaJIJlaX C HeOnHOPOAHbIM ylUy1peHHeM 3nP y1 C YqeTOM FiAepHOt CIIkiHOBO3 KH@@J'3kiII B pa3JIWIHbIX IIpeAeJIbHbIX CJIyqaFIX.

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“…A consistent quantum statistical investigation of saturation of a nonuniformly broadened EPR line was carried out in Ref. 47 by taking into account spectral diffusion and the dipole-dipole reservoir. Role of the flip-flip and flip-flop transitions for the dynamic polarization of nuclei was analyzed in Ref.…”

Section: Introductionmentioning

confidence: 99%

Statistical Theory of Spin Relaxation and Diffusion in Solids

Kuzemsky

2006

J Low Temp Phys

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A comprehensive theoretical description is given for the spin relaxation and diffusion in solids. The formulation is made in a general statistical-mechanical way. The method of the nonequilibrium statistical operator (NSO) developed by Zubarev is employed to analyze a relaxation dynamics of a spin subsystem. Perturbation of this subsystem in solids may produce a nonequilibrium state which is then relaxed to an equilibrium state due to the interaction between the particles or with a thermal bath (lattice). The generalized kinetic equations were derived previously for a system weakly coupled to a thermal bath to elucidate the nature of transport and relaxation processes. In this paper, these results are used to describe the relaxation and diffusion of nuclear spins in solids. The aim is to formulate a successive and coherent microscopic description of the nuclear magnetic relaxation and diffusion in solids. The nuclear spin-lattice relaxation is considered and the Gorter relation is derived. As an example, a theory of spin diffusion of the nuclear magnetic moment in dilute alloys (like Cu-Mn) is developed.It is shown that due to the dipolar interaction between host nuclear spins and impurity spins, a nonuniform distribution in the host nuclear spin system will occur and consequently the macroscopic relaxation time will be strongly determined by the spin diffusion. The explicit expressions for the relaxation time in certain physically relevant cases are given.

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Nuclear relaxation and NMR saturation in a crystal with a magnetic impurity

Cited by 6 publications

References 10 publications

Dynamic Nuclear Polarization in Solids: The Birth and Development of the Many-Particle Concept

Dynamic Nuclear Polarization in Solids: The Birth and Development of the Many-Particle Concept

Relaxation and Nuclear Dynamic Polarization in the Case of Inhomogeneous EPR Broadening

Statistical Theory of Spin Relaxation and Diffusion in Solids

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