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  • 1
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    Stability and diffusion of interstitial and substitutional Mn in GaAs of different doping types (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-09-25
    Description: Author(s): L. M. C. Pereira, U. Wahl, S. Decoster, J. G. Correia, L. M. Amorim, M. R. da Silva, J. P. Araújo, and A. Vantomme We report on β − emission channeling experiments on the lattice location and thermal stability of Mn impurities (〈0.05%) in both semi-insulating and heavily n -type doped GaAs. In addition to the majority of the Mn impurities substituting for Ga, up to 30% occupy tetrahedral interstitial sites with... [Phys. Rev. B 86, 125206] Published Mon Sep 24, 2012
    Keywords: Semiconductors I: bulk
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Mixed Zn and O substitution of Co and Mn in ZnO (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-09-07
    Description: Author(s): L. M. C. Pereira, U. Wahl, S. Decoster, J. G. Correia, L. M. Amorim, M. R. da Silva, J. P. Araújo, and A. Vantomme The physical properties of an impurity atom in a semiconductor are primarily determined by the lattice site it occupies. In general, this occupancy can be correctly predicted based on chemical intuition, but not always. We report on one such exception in the dilute magnetic semiconductors Co- and Mn... [Phys. Rev. B 84, 125204] Published Tue Sep 06, 2011
    Keywords: Semiconductors I: bulk
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Evidence of N substitution by Mn in GaN (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-11-06
    Description: Author(s): L. M. C. Pereira, U. Wahl, J. G. Correia, S. Decoster, L. M. Amorim, M. R. da Silva, J. P. Araújo, and A. Vantomme We report on the lattice location of Mn in wurtzite GaN using β − emission channeling. In addition to the majority substituting for Ga, we locate up to 20% of the Mn atoms in N sites. We propose that the incorporation of Mn in N sites is enabled under sufficiently high concentrations of N vacancies, ... [Phys. Rev. B 86, 195202] Published Mon Nov 05, 2012
    Keywords: Semiconductors I: bulk
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Field-aligned currents in the earth's magnetotail (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Direct measurements of the plasma velocity distributions and simultaneous observations of magnetic fields are used to examine the character of field-aligned currents in the earth's magnetotail during the recovery phase of a magnetic substorm. Three contiguous field-aligned current sheets are identified at the interface between the magnetotail lobe and plasma sheet. Average current densities within these three current sheets are, in order of decreasing distance to the plasma sheet, +3.3 x 10 to the -9th, -1.3 x 10 to the -8th, and +1.1 x 10 to the -8th A/sq m, respectively.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 86; Feb. 1
    Format: text
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  • 5
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    Velocity distributions of ion beams in the plasma sheet boundary layer (1986)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The value of measured ion-beam velocity distributions as diagnostic tools to characterize the propagation and acceleration of particle beams in the plasma-sheet boundary layer is assessed. Models based on adiabatic deformation of a flowing Maxwellian, acceleration by field-aligned potentials, and current-sheet acceleration are fitted to observational data, and the results are presented in extensive diagrams and graphs. The data are found to be consistent with models involving field-aligned or cross-tail potential drops, but not with models based solely on the adiabatic deformation of initially isotropic distributions.
    Keywords: GEOPHYSICS
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  • 6
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    Three-dimensional plasma measurements within the earth's magnetosphere (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Magnetospheric measurements of three-dimensional velocity distributions for positive ions and electrons in the energy range from 1 eV to 45 keV are reported which were obtained with quadrispherical Lepedeas on ISEE 1 and 2. The instrumentation is briefly described, and an extension of energy-time spectrograms to three-dimensional summaries via the use of ancillary energy-spin phase spectrograms for multiple analyzers is outlined. Macroscopic plasma parameters for two crossings of the dayside magnetopause are presented, along with a preliminary evaluation of the kinematical motions of low-energy charged particles within the terrestrial ring current. Nonmonotonic electron velocity distributions presumably related to the generation of electron cyclotron harmonic instabilities are examined. The possible signature of diffusion driven by electrostatic waves is considered, and velocity distributions of positive ions in the dawn magnetotail are investigated.
    Keywords: GEOPHYSICS
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  • 7
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    Observations pertaining to the dynamics of the plasma sheet (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Plasmas on the surface of the plasma sheet at its interface with high-latitude lobes are studied at about 30-40 earth radii (Re) in the tail of the earth's magnetosphere with Lepedea plasma instrumentation on board the earth-orbiting Imp 7 and Imp 8 satellites. Protons at this interface are frequently found to be flowing toward earth with velocities greater than 400 km/s. Proton bulk speeds measured near the plasma sheet surface are typically greater than those at locations deeper within the plasma sheet. Ten of the twenty cases studied exhibit plasma sheet cooling. Typical plasma sheet conditions are observed to prevail deep within the plasma sheet coincident with the earthward streaming at the boundary of the plasma sheet. A three-parameter model is described that explains the velocity distributions measured for the earthward-jetting plasma.
    Keywords: GEOPHYSICS
    Type: AD-A079568 , Journal of Geophysical Research; 84; Sept. 1
    Format: text
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