Electron Spin Relaxation Phenomena in Solids

Standley, K J; Vaughan, R. A.

doi:10.1007/978-1-4899-6539-4

Cited by 142 publications

(141 citation statements)

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“…(5), the nuclear spin relaxation rate depends on the electron spin correlation time t e as T À1 1 / t À1=4 e in the slow motion regime w L t e ) 1. Therefore the low-temperature behavior of the relaxation rate is given by t À1 e / T 9 , as expected for a two-phonon Raman process at temperatures far below the Debye temperature q D [35,38,40].…”

Section: Background Ionsmentioning

confidence: 60%

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F centers in LiF: A nuclear magnetic resonance study

Klempt

Kanert

Suter

2003

Physica Status Solidi (b)

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PACS 61.82. Ms, 76.30.Mi, 76.60.Es Ionizing radiation like g-rays, electrons, or swift heavy ions create a variety of point defects in dielectric materials. The largest fraction of the defects consists of the paramagnetic F centers. Here, we study those F centers in LiF by nuclear magnetic resonance. Nuclear spin relaxation (T 1 ) measurements serve as a probe for the F centers offering the possibility to investigate their dynamics as a function of temperature and irradiation dose. Moreover, one is able to estimate the content of the paramagnetic defects from the T 1 -data over a wide range of concentration. We further observed and analyzed radiation annealing occurring at temperatures above 360 K.

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Section: Background Ionsmentioning

confidence: 60%

“…(6)). The fact, that this is not exactly true indicates, that correlation times of the manganese ions depend weakly on the magnetic field, as discussed in [35,40]. Equation (4) can be used to estimate the concentration N p of the paramagnetic centers.…”

Section: Background Ionsmentioning

confidence: 99%

F centers in LiF: A nuclear magnetic resonance study

Klempt

Kanert

Suter

2003

Physica Status Solidi (b)

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“…In this form of ODMR spectroscopy a microwave field partially saturates the spin transition and disturbs the equilibrium magnetization while the change of MCD is monitored at a fixed optical wavelength as a function of the magnetic field. This technique can be used to measure spin-lattice relaxation [3][4][5] or to distinguish paramagnetic centers with different optical absorption bands. [6][7][8] In addition, in samples such as frozen aqueous solutions of metalloproteins, where the molecules are randomly orientated, information about the relative orientations of magnetic and optical axes can be obtained.…”

Section: Introductionmentioning

confidence: 99%

Optically detected electron paramagnetic resonance by microwave modulated magnetic circular dichroism

Börger

Bingham

Gutschank

et al. 1999

The Journal of Chemical Physics

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Electron paramagnetic resonance ͑EPR͒ can be detected optically, with a laser beam propagating perpendicular to the static magnetic field. As in conventional EPR, excitation uses a resonant microwave field. The detection process can be interpreted as coherent Raman scattering or as a modulation of the laser beam by the circular dichroism of the sample oscillating at the microwave frequency. The latter model suggests that the signal should show the same dependence on the optical wavelength as the MCD signal. We check this for two different samples ͓cytochrome c-551, a metalloprotein, and ruby (Cr 3ϩ :Al 2 O 3 )͔. In both cases, the observed wavelength dependence is almost identical to that of the MCD signal. A quantitative estimate of the amplitude of the optically detected EPR signal from the MCD also shows good agreement with the experimental results.

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“…The bulk material was undoped. It should be pointed out that for such a high (953) concentration of magnetic impurities the spin-lattice relaxation responsible for the magnetization relaxation goes through spin clusters and is due to the modulation of the exchange interaction [2,4]. In this case a comparison of two results can give some information about the formation of the clusters.…”

mentioning

confidence: 99%

“…After a short laser pulse that warms the lattice, the spin system warms up to the new temperature by means of spin-lattice relaxation [4], changing the sample magnetization (given by the spins' alignment). These changes induced a voltage in the pick-up coil.…”

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confidence: 99%

Unusual Time Dependence of Magnetization Relaxation in MBE Grown Epilayer of CdMnTe

et al. 1995

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The temporal behavior of the magnetization due to the spin-lattice relaxation for bulk and MBE grown epilayer of CdMnTe is compared. The time dependence of the epilayer magnetization changes (dM/dt) is nonmonotonic. After the main part, a second structure appears. It can be expłained only by the assumption of energy storage and a delayed additionał rise of specimen temperature. The nature of the storage is unknown.PACS numbers: 76.30.Fc, 68.60.WmOur previous results of magnetization relaxation measurements for diluted magnetic semiconduction [1] show that the relaxation below an external magnetic field of 10 T, for CdMnTe with Mn content below 2%, is determined by the transfer of polarization to unknown defects or impurities [2]. The data for CdMnS [3] pointed out the importance of the growth process on this part of the relaxation. To check this effect we investigated materials grown by totally different methods, namely modifled Bridgman and MBE. Both samples have an Mn content of about 10%. The epilayer (Mn content 9.5% and In doping of the order of 10 19 cm-3) was grown on a GaAs substrate with a thin ZnCdTe buffer (sample #03074 CMT:In). The bulk material was undoped. It should be pointed out that for such a high (953)

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Electron Spin Relaxation Phenomena in Solids

Cited by 142 publications

References 0 publications

F centers in LiF: A nuclear magnetic resonance study

F centers in LiF: A nuclear magnetic resonance study

Optically detected electron paramagnetic resonance by microwave modulated magnetic circular dichroism

Unusual Time Dependence of Magnetization Relaxation in MBE Grown Epilayer of CdMnTe

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