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Showing results 101 to 108 of 108
   A Reply to the Comment by A. Rivera et al.Krüger, Jan-Kristian  ; ; Baller, Jörg et alin Physical Review Letters (2005), 94 Detailed reference viewed: 118 (3 UL)Comment on "thermal glass transition beyond the vogel-fulcher-tammann behavior for glass forming diglycidylether of bisphenol A".; ; et al in Physical Review Letters (2005), 94(12), 129603-129604 Detailed reference viewed: 105 (1 UL) Self-Poisoning of Crystal Nuclei in Hard-Rod LiquidsSchilling, Tanja ; in Physical Review Letters (2004), 92(8), We report a Monte Carlo study of the pathway for crystal nucleation in a fluid of hard, colloidal rods. In the earliest stages of nucleation, a lamellar crystallite forms. Subsequent thickening of this ... [more ▼] We report a Monte Carlo study of the pathway for crystal nucleation in a fluid of hard, colloidal rods. In the earliest stages of nucleation, a lamellar crystallite forms. Subsequent thickening of this lamella is hampered by the fact that the top and bottom surfaces of this crystallite are preferentially covered by rods that align parallel to the surface. As a consequence, subsequent growth of individual crystals is stunted. Experimental evidence for such stunted crystal growth has recently been reported by Maeda and Maeda in experiments on suspensions of colloidal rods [Phys. Rev. Lett. 90, 018303 (2003)]. The simulations suggest that, in experiments, the growth of multilayer colloidal crystals can be selectively enhanced by the application of an external aligning field. [less ▲] Detailed reference viewed: 99 (1 UL)Range of magnetic correlations in nanocrystalline soft magnetsMichels, Andreas ; ; et alin Physical Review Letters (2003), 91 We have obtained the magnetic field dependence of static ferromagnetic correlations in nanocrystalline electrodeposited Co and Ni by means of the correlation function of the spin misalignment, determined ... [more ▼] We have obtained the magnetic field dependence of static ferromagnetic correlations in nanocrystalline electrodeposited Co and Ni by means of the correlation function of the spin misalignment, determined from small-angle neutron scattering data. The approach yields a correlation length lC, which is a measure for the spatial extent of inhomogeneities in the magnetization distribution. The correlation length depends strongly on the applied magnetic field with values ranging from 94 nm in nanocrystalline Co at low fields to about 15 nm at saturation. The results for lC indicate that in Co the main source of nonuniformity in the spin system is the anisotropy field of each individual crystallite, whereas in nanocrystalline Ni the main sources of spin disorder originate from twin faults or from the defect cores of grain boundaries. [less ▲] Detailed reference viewed: 122 (0 UL)Thermal Glass Transition Beyond the Vogel-Fulcher-Tammann Behavior for Glass Forming Diglycidylether of Bisphenol AKrüger, Jan-Kristian ; ; Baller, Jörg et alin Physical Review Letters (2002), 89 For the low molecular weight fragile liquid diglycidyl ether of bisphenol A we report, based on Brillouin and dielectric spectroscopy, on a thermal glass transition where the relaxation time of the α ... [more ▼] For the low molecular weight fragile liquid diglycidyl ether of bisphenol A we report, based on Brillouin and dielectric spectroscopy, on a thermal glass transition where the relaxation time of the α process does not go to infinity. Instead, the structural α relaxation disappears spontaneously at the transition point. That discontinuity in relaxation time coincides with a kink in the longitudinal hypersonic velocity and determines unambiguously the transition from the liquid to the glassy state. [less ▲] Detailed reference viewed: 92 (0 UL)Kinetically assisted potential sputtering of insulators by highly charged ions; ; et al in Physical Review Letters (2001), 86(16), 3530-3533 A new form of potential sputtering has been found for impact of slow (less than or equal to 1500 eV) multiply charged Xe ions (charge states up to q = 25) on MgOx. In contrast to alkali-halide or SiO2 ... [more ▼] A new form of potential sputtering has been found for impact of slow (less than or equal to 1500 eV) multiply charged Xe ions (charge states up to q = 25) on MgOx. In contrast to alkali-halide or SiO2 surfaces this mechanism requires the simultaneous presence of electronic excitation of the target material and of a kinetically formed collision cascade within the target in order to initiate the sputtering process. This kinetically assisted potential sputtering mechanism has been identified to be present for ether insulating surfaces as well. [less ▲] Detailed reference viewed: 107 (0 UL)Comment on magnetic correlations in nanostructured ferromagnets; Michels, Andreas in Physical Review Letters (2001), 87(14), 149701-149701 A Comment on the Letter by Jörg F. Löffler, Hans Benjamin Braun, and Werner Wagner, Phys. Rev. Lett. 85, 1990 (2000). The authors of the Letter offer a Reply. Detailed reference viewed: 185 (0 UL)Threshold for potential sputtering of LiF; ; et al in Physical Review Letters (1999), 83(19), 3948-3951 We have measured total sputtering yields for impact of slow (less than or equal to 100 eV) singly and doubly charged ions on LiF. The minimum potential energy necessary to induce potential sputtering (PS ... [more ▼] We have measured total sputtering yields for impact of slow (less than or equal to 100 eV) singly and doubly charged ions on LiF. The minimum potential energy necessary to induce potential sputtering (PS) from UF was determined to be about 10 eV. This threshold coincides with the energy necessary to produce a cold hole in the valence band of LiF by resonant neutralization. This allows the first unambiguous identification of PS induced by cold holes. Further stepwise increase of the sputtering yield with higher projectile potential energies provides evidence for additional defect-mediated sputtering mechanisms operative in alkali halides. [less ▲] Detailed reference viewed: 101 (0 UL) |
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