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  • American Institute of Physics (AIP)  (6)
  • American Association of Petroleum Geologists (AAPG)
  • Society of Economic Geologists (SEG)
  • 1995-1999  (4)
  • 1990-1994  (2)
  • 1
    Digitale Medien
    Digitale Medien
    Structural and magnetic properties of stage 2 CocMn1−cCl2-graphite intercalation compounds : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6098-6100 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Stage 2 CocMn1−cCl2-graphite intercalation compounds (0≤c≤1) approximate two-dimensional site-random XY spin systems with a competition between ferromagnetic [J(Co–Co) and J(Co–Mn)], and antiferromagnetic exchange interactions [J(Mn–Mn)]. The magnetic phase diagram and critical behavior of these compounds are studied by means of ac and dc magnetic susceptibility. For c≥ (R18)0.45 the phase transition occurs between the paramagnetic phase and the ferromagnetic phase. The critical exponents of γ and β do not change with dilution of Mn atoms: γ=2.31 and β=0.085 for c=0.90.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.350058
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  • 2
    Digitale Medien
    Digitale Medien
    Ultrafast dynamics of holes in GaAs probed by two-color femtosecond spectroscopy (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 64-66 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Ultrafast relaxation dynamics of light and heavy holes in GaAs following femtosecond valence-to-conduction-band excitation are measured by probing the light- and heavy-to-split-off hole transitions at different midinfrared wavelengths using the recently developed broadly tunable femtosecond optical parametric oscillator. The initial relaxation times are less than 75 fs, and a spectral hole-burning effect is seen. The results suggest that carrier–carrier and optical-phonon scattering, in particular, polar optical-phonon scattering, are the primary processes leading to the initial redistribution of heavy and light holes. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.121724
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  • 3
    Digitale Medien
    Digitale Medien
    Femtosecond midinfrared-induced luminescence study of the ultrafast dynamics of split-off holes in GaAs (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 1734-1736 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The ultrafast relaxation dynamics of split-off holes in GaAs are studied using a time-resolved two-wavelength excitation luminescence technique. Following valence-to-conduction-band transitions that are excited by near-infrared femtosecond pulses, delayed midinfrared femtosecond pulses are used to promote holes from the heavy-hole band to the split-off-hole band. The subsequent conduction-to-split-off-hole luminescence indicates that the room-temperature lifetime of split-off holes in GaAs is approximately 50 fs. The accompanying changes in conduction-to-heavy-hole-and-light-hole luminescence when holes are transferred to the split-off band are also observed. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.123671
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  • 4
    Digitale Medien
    Digitale Medien
    High-repetition-rate femtosecond optical parametric oscillator based on periodically poled lithium niobate (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 70 (1997), S. 3341-3343 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A high-repetition-rate, femtosecond optical parametric oscillator based on bulk periodically poled lithium niobate is described. This optical parametric oscillator is continuously tunable from 1.12 to 1.50 μm in the signal branch, and signal pulses as short as 60 fs have been observed. The corresponding turning range for the idler branch is from 1.68 to 2.72 μm. Modifications which should result in a femtosecond optical parametric oscillator with a pumping threshold of less than 50 mW are discussed. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.119164
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  • 5
    Digitale Medien
    Digitale Medien
    Switching dynamics of near-infrared vertical-cavity surface-emitting lasers by injection of near-infrared and midinfrared femtosecond pulses (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 1664-1666 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We report the switch-off and recovery dynamics of a vertical-cavity surface-emitting semiconductor laser induced by injection of near-infrared or midinfrared femtosecond optical pulses. The laser is switched off by carrier-density depletion or carrier-heating effects, depending on the spectral range of the injected pulses. In both cases, the recovery of the laser output can be described by standard rate equations. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.124785
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  • 6
    Digitale Medien
    Digitale Medien
    Magnetic properties of random-mixture graphite intercalation compounds (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5749-5751 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The magnetic properties of a quasi-two-dimensional mixed ferromagnetic and antiferromagnetic system, stage-2 CocMn1−cCl2 -graphite intercalation compounds (GICs), have been studied by dc magnetic susceptibility measurements. The Curie–Weiss temperature determined as a function of Co concentration indicates that the intraplanar exchange interaction between Co2+ and Mn2+ is ferromagnetic and that J(Co-Mn)=1.3 [J(Co-Co)||J(Mn-Mn)||]1/2. With decreasing Co concentration c, the transition temperature tends to decrease to zero as c approaches 0.5 (the percolation concentration for the triangular lattice sites), but is not reduced to zero even below c=0.5. There may be a possibility of a spin-glass phase for 0≤c〈0.4 arising from the competition between J(Mn-Mn), J(Co-Mn), and J(Mn-Mn).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.345951
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