Low-temperature nuclear spin-lattice relaxation in glasses - homogeneous and inhomogeneous averaging

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  • Philipps-Universität Marburg
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Details

OriginalspracheEnglisch
Seiten (von - bis)501-509
Seitenumfang9
FachzeitschriftJournal of non-crystalline solids
Jahrgang66
Ausgabenummer3
PublikationsstatusVeröffentlicht - 2 Aug. 1984
Extern publiziertJa

Abstract

A phenomenological model is presented which is able to explain both temperature and magnetic field dependences of nuclear spin-lattice relaxation rates T1-1 observed recently in glasses at low temperatures. The model assumes randomly distributed defect centres, typical of glasses, producing internal fluctuating fields. The only restrictive assumption is a power law for the distance dependence of the responsible interaction. In accordance with experiment, homogeneous and inhomogeneous relaxation, corresponding to exponential and non-exponential relaxation behaviour, is predicted in the cases of rapid and slow spin diffusion, respectively. Describing the fluctuating interactions by a BPP-type spectral density and assuming an Arrhenius law for the correlation time, explicit expressions for T-1- are obtained. It is shown that by comparison of homogeneous and inhomogeneous relaxation data information on the type of interaction and the density of defect centres can be obtained.

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Low-temperature nuclear spin-lattice relaxation in glasses - homogeneous and inhomogeneous averaging. / Stöcmann, H. J.; Heitjans, P.
in: Journal of non-crystalline solids, Jahrgang 66, Nr. 3, 02.08.1984, S. 501-509.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

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TY - JOUR

T1 - Low-temperature nuclear spin-lattice relaxation in glasses - homogeneous and inhomogeneous averaging

AU - Stöcmann, H. J.

AU - Heitjans, P.

PY - 1984/8/2

Y1 - 1984/8/2

N2 - A phenomenological model is presented which is able to explain both temperature and magnetic field dependences of nuclear spin-lattice relaxation rates T1-1 observed recently in glasses at low temperatures. The model assumes randomly distributed defect centres, typical of glasses, producing internal fluctuating fields. The only restrictive assumption is a power law for the distance dependence of the responsible interaction. In accordance with experiment, homogeneous and inhomogeneous relaxation, corresponding to exponential and non-exponential relaxation behaviour, is predicted in the cases of rapid and slow spin diffusion, respectively. Describing the fluctuating interactions by a BPP-type spectral density and assuming an Arrhenius law for the correlation time, explicit expressions for T-1- are obtained. It is shown that by comparison of homogeneous and inhomogeneous relaxation data information on the type of interaction and the density of defect centres can be obtained.

AB - A phenomenological model is presented which is able to explain both temperature and magnetic field dependences of nuclear spin-lattice relaxation rates T1-1 observed recently in glasses at low temperatures. The model assumes randomly distributed defect centres, typical of glasses, producing internal fluctuating fields. The only restrictive assumption is a power law for the distance dependence of the responsible interaction. In accordance with experiment, homogeneous and inhomogeneous relaxation, corresponding to exponential and non-exponential relaxation behaviour, is predicted in the cases of rapid and slow spin diffusion, respectively. Describing the fluctuating interactions by a BPP-type spectral density and assuming an Arrhenius law for the correlation time, explicit expressions for T-1- are obtained. It is shown that by comparison of homogeneous and inhomogeneous relaxation data information on the type of interaction and the density of defect centres can be obtained.

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JO - Journal of non-crystalline solids

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