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  • Springer  (585)
  • Oxford University Press  (28)
  • American Association for the Advancement of Science  (13)
  • American Institute of Physics (AIP)  (12)
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  • 1
    Electronic Resource
    Electronic Resource
    Antiferromagnetic form factor of Sr2CuO2Cl2 (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4524-4526 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Neutron diffraction techniques have been used to study the antiferromagnetic form factor of Sr2CuO2Cl2, which has the body-centered-tetragonal (I4/mmm) K2NiF4-type structure (the same as that of tetragonal La2CuO4 but with the out-of-plane oxygens replaced by Cl and the La by Sr). The antiferromagnetic form factor was obtained at 15 K by measuring the integrated intensities of the ( (1)/(2) (1)/(2) 0), ( (1)/(2) (1)/(2) 2), ( (1)/(2) (1)/(2) 3), ( (3)/(2) (3)/(2) 0), ( (3)/(2) (3)/(2) 6), ( (3)/(2) (5)/(2) 1), ( (3)/(2) (3)/(2) 8), and ( (5)/(2) (5)/(2) 0) magnetic reflections of a single crystal of Sr2CuO2Cl2. The experimentally determined magnetic form factor is similar to that of La2CuO4. The experimental data were compared with the Cu2+ magnetic form factor and with the results of band theoretical calculations. We find that the fit to the experimental data is improved if one assumes a dipolar spin polarization on the in-plane oxygen ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344857
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  • 2
    Electronic Resource
    Electronic Resource
    The antiferromagnetic form factor of La2NiO4 : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4860-4862 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Neutron-diffraction techniques have been used to study the antiferromagnetic form factor of a La2NiO4 single crystal at 15 K. The antiferromagnetic form factor was obtained by measuring the integrated intensities of 16 magnetic reflections. A plateau is clearly seen at low Q (up to 3 A(ring)−1) in the experimentally determined form factor, similar to those observed for La2CuO4 and Sr2CuO2Cl2. As in the case of these latter compounds, the fit of the experimental data by a Ni2+ ionic form factor is not satisfactory. The experimental data are compared with a recent spin-polarized band calculation and with a covalency model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348204
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  • 3
    Electronic Resource
    Electronic Resource
    Processing of Bi2Sr2CaCu2Ox thick films from nitrate precursors (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 2558-2560 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High-quality Bi2Sr2CaCu2Ox/Ag superconducting tapes were fabricated directly from the nitrate salts of Bi, Sr, Ca, and Cu by the partial-melt-growth technique. Nitrate particles were deposited electrostatically on the Ag substrate and heat treated. After process optimization of the superconducting tapes, the best samples showed typical Tc of 89 K with zero applied field critical current density of 2×104 A/cm2 (Ic=11.2 A) at 77 K and 2.6×105 A/cm2 (Ic=190 A) at 4.2 K. Unlike films grown using solid state reacted precursor powders, these films lacked the typical Bi-free, needlelike defects and possessed a smooth morphology. X-ray diffraction patterns showed the film to be highly c-axis oriented. The processing of these tapes significantly reduces the overall fabrication time from precursor materials preparation to final heat treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110432
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  • 4
    Electronic Resource
    Electronic Resource
    In situ measurements and numerical simulation of wave-electron interactions in a crossed-field amplifier (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 3384-3386 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report detailed two-dimensional in situ measurements of electron density inside an injected-beam crossed-field amplifier operating at 150 MHz. It is demonstrated that during amplification there is a spatial redistribution of the cycloidal electron beam as electrons are drawn to the anode. These measurements have been compared with a numerical simulation [G. E. Dombrowski, IEEE Trans. Electron. Devices 35, 2060 (1988)] which predicts a change in electron trajectories but gives a larger electron loss than was measured.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105682
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  • 5
    Electronic Resource
    Electronic Resource
    Optical activity in the vacancy ordered III2VI3 compound semiconductor (Ga0.3In0.7)2Se3 (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 3066-3068 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Great optical activity is realized by a vacancy ordered III2VI3 compound (Ga0.3In0.7)2Se3 with point group 6 which is based on wurtzite structure and characterized by the screw arrangement of cation atoms along the c axis. The transition of the fundamental absorption edge is direct and the band gap is estimated to be 2.05 eV. An anomalous optical rotatory dispersion around the absorption edge is observed and the maximum rotatory power of 125°/mm is obtained at λ=620 nm. The optical activity for red light is always above 60°/mm, that is 4–6 times as large as that of α quartz. (Ga0.3In0.7)2Se3 single crystal is very useful, especially for the He–Ne laser as an optically active substance; the rotatory power reaches 103°/mm, being more than 5 times of α quartz. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114866
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  • 6
    Electronic Resource
    Electronic Resource
    Formation of elemental Ag precipitates in AlGaAs by ion implantation and thermal annealing (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 3501-3503 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report transmission electron microscopy (TEM) studies of precipitation in Ag-implanted and annealed Al0.3Ga0.7As. Silver was chosen because it does not form compounds with Ga and/or As when precipitating based on bulk thermodynamics arguments. TEM confirmed the formation of an elemental metal/semiconductor composite, which consists of nanometer-sized Ag (fcc structure) precipitates dispersed in the matrix. The precipitates are nonspherical and have an orientation relationship to Al0.3Ga0.7As of (200)Ag//(200)AlGaAs, (02-2)Ag//(02-2)AlGaAs, and [011]Ag//[011]AlGaAs. High temperature (900 °C) anneals transform the phase of the precipitate to hexagonal, Ag3(GaAl) compounds. This shape distribution has been correlated with inhomogeneous broadening of the optical absorption. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120372
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  • 7
    Electronic Resource
    Electronic Resource
    Anisotropy of superconductivity from MgB2 single crystals (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 2779-2781 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnesium diboride (MgB2) single crystals, with a maximum size of 0.5×0.5×0.02 mm3, were grown by the vapor transport method in a sealed molybdenum crucible. A superconducting transition with the onset temperature of 38.6 K was confirmed by both transport and magnetization measurements. The upper critical field anisotropy ratio, Hc2(parallel)ab(0)/Hc2(parallel)c(0), was estimated to be 2.6 from the magnetic field-temperature phase diagram for MgB2 single crystals. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1413729
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  • 8
    Electronic Resource
    Electronic Resource
    Particle rotation in a Couette flow (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 220-224 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The rotational velocity of neutrally buoyant particles was measured in a planar Couette flow. The flow cross section is rectangular with a 4-to-1 (200 mm/50 mm) aspect ratio. The mixtures consist of uniform polystyrene spheres and a glycerol–water solution of specific density 1.052. Four sphere sizes have been tested: 3, 4.76, 6.35, and 7.94 mm. Particle motion in turbulent flow was recorded with a high-speed SP-2000 motion analysis system. The characteristics of particle motion, including particle spin, were measured as a function of the distance from the wall, at three shear rates corresponding to Re=4.6, 6.8, and 9.2×104. It was found that the particle angular velocity normalized by shear rate is a function of the normalized distance to the moving and stationary walls. The flow conditions are defined with measurements on mean velocities, particle velocity fluctuations, kinetic energy, inertial stresses, and diffusion coefficients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858349
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  • 9
    Electronic Resource
    Electronic Resource
    Full observation of single-atom dynamics in cavity QED (1999)
    Springer
    Applied physics 68 (1999), S. 1095-1108 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 03.65.Bz; 06.20.Dk; 42.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We report the use of broadband heterodyne spectroscopy to perform continuous measurement of the interaction energy Eint between one atom and a high-finesse optical cavity, during individual transit events of ≈250 μs duration. We achieve a fractional sensitivity ≈4×10-4/ to variations in Eint/? within a measurement bandwidth that covers 2.5 decades of frequency (1–300 kHz). Our basic procedure is to drop cold cesium atoms into the cavity from a magnetooptic trap while monitoring the cavity’s complex optical susceptibility with a weak probe laser. The instantaneous value of the atom–cavity interaction energy, which in turn determines the coupled system’s optical susceptibility, depends on both the atomic position and (Zeeman) internal state. Measurements over a wide range of atom–cavity detunings reveal the transition from resonant to dispersive coupling, via the transfer of atom-induced signals from the amplitude to the phase of light transmitted through the cavity. By suppressing all sources of excess technical noise, we approach a measurement regime in which the broadband photocurrent may be interpreted as a classical record of conditional quantum evolution in the sense of recently developed quantum trajectory theories.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050751
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  • 10
    Electronic Resource
    Electronic Resource
    Iso-spectral deformations of general matrix and their reductions on Lie algebras (1996)
    Springer
    Communications in mathematical physics 178 (1996), S. 765-788 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We study an iso-spectral deformation of the general matrix which is a natural generalization of the nonperiodic Toda lattice equation. This deformation is equivalent to the Cholesky flow, a continuous version of the Cholesky algorithm, introduced by Watkins. We prove the integrability of the deformation and give an explicit formula for the solution to the initial value problem. The formula is obtained by generalizing the orthogonalization procedure of Szegö. Using the formula, the solution to the LU matrix factorization can the constructed explicitly. Based on the root spaces for simple Lie algebras, we consider several reductions of the equation. This leads to generalized Toda equations related to other classical semi-simple Lie algebras which include the integrable systems studied by Bogoyavlensky and Kostant. We show these systems can be solved explicitly in a unified way. The behaviors of the solutions are also studied. Generically, there are two types of solutions, having either sorting property or blowing up to infinity in finite time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02108824
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