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  • 1
    Electronic Resource
    Electronic Resource
    Observation of single-ion magnon bound states in the metamagnet FeI2 (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5085-5087 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The results of electron spin resonance measurements at high frequencies are reported on the antiferromagnet FeI2 with strong uniaxial anisotropy. We have found new signals whose g value is 16.5 together with the signal with g=7.0 reported before [Fert et al., Solid State Commun. 26, 693 (1978)]. We interpret these electric spin resonance signals as originating from single-ion four magnon and two magnon bound states, respectively. Some of the exchange interaction constants are determined from the analysis of the results. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373256
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  • 2
    Electronic Resource
    Electronic Resource
    In situ x-ray topography of silicon carbide during crystal growth by sublimation method (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 2829-2832 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have developed an instrument for real-time observation of silicon carbide (SiC) crystal during the sublimation growth process by x-ray topography. It is constructed by combining an x-ray goniometer and a crystal-growth chamber. The vertical goniometer consists of three circles, an α circle for the x-ray source, a β circle for the detector, and a cursive-phi circle for the azimuthal rotation of the sample. The growing crystal boule is set at the center of the goniometer glued on a crucible lid. Transmission topographs are taken using an asymmetric (101¯1) reflection with the scattering angle 2θB=β−α from the (0001)-oriented boule. A rotating-anode 18 kW generator with a molybdenum target is employed as the x-ray source. Topographs are observed by a direct imaging system using a charge-coupled device camera. Incident and scattered x-ray beams pass through beryllium windows mounted on the bottom and top flanges of the crystal-growth chamber, respectively. The crucibles are also designed for in situ measurements so that the x-ray beam path is separated from the source materials. The in situ topographs demonstrated the movement of micropipes and other defects during the crystal growth. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150698
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  • 3
    Electronic Resource
    Electronic Resource
    A directly water-cooled silicon crystal for high power insertion devices (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 4482-4486 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Directly water-cooled silicon crystals with various types of water channels and cooling fins were fabricated and tested at the 27-pole wiggler beamline BL13 of the Photon Factory. Double-crystal rocking curves for a Si(111) reflection indicated that the performance of a grooved silicon crystal in cooling efficiency is significantly improved by replacing conventional semicircular water channels and cooling fins with flat ones with optimum dimensions. For this design, the width of a Si(111) rocking curve was independent of a wiggler power within 2/3 of the full power. In this power range, a highly stable monochromatized beam with an energy resolution required in x-ray absorption near-edge structure experiments (ΔE/E∼2×10−4) was obtained. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145346
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  • 4
    Electronic Resource
    Electronic Resource
    Acoustic emission and normal components in an alternating current superconducting coil (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4250-4255 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The relationship between acoustic emission (AE) signals and normal components that appeared in a superconducting winding in an alternating current superconducting coil cooled in liquid helium was investigated around the time of quench initiation. The coil was impregnated with epoxy to prevent wire motion of the superconducting winding. The operating current of 50 Hz at the coil was ramped from zero to a level that caused quenching of the coil, where external heat energy was not applied to the superconducting winding. AE envelopes were used for the investigation because the envelopes provide higher time resolution and higher dynamic range than the method of using AE counting rates that were conventionally used in monitoring direct current superconducting magnets and coils. AE envelopes appeared immediately after the appearance of normal components in the superconducting winding before and after quench initiation. In the cases before quench initiation, normal components appeared several tens of milliseconds earlier than quench initiation. The AE envelopes appeared momentarily immediately after the normal components. When the quench initiated, AE envelopes drastically increased in accordance with the high rate of increase of the normal components in the superconducting winding. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370338
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  • 5
    Electronic Resource
    Electronic Resource
    Observation of single ion transitions in the ordered states of FeCl2 : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 3981-3982 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electron spin resonance (ESR) experiments using a far infrared laser and a superconducting magnet have been performed on a single crystal sample of the metamagnet FeCl2. A new ESR signal has been observed at a much higher frequency than the ordinary antiferromagnetic and ferromagnetic resonance frequencies. The new ESR signal originates from a transition within the lowest triplet state of single Fe2+ ions in the presence of exchange fields. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364913
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  • 6
    Electronic Resource
    Electronic Resource
    Preparation of superconducting thin films of Bi(Pb)-Sr-Ca-Cu-O by the thermal decomposition method (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 2297-2299 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The thin Bi(Pb)-Sr-Ca-Cu-O film composed of the high Tc phase has been successfully made by the thermal decomposition method using an organic acid salt, which is spread on the MgO(100) substrate by the spin-coat method. A preannealing process before a final annealing is added to the usual film preparation in order to prevent the metallic compounds in the salt from diverging to the atmosphere. The film obtained here has a flatter and smoother surface, and a higher zero-resistivity temperature Tc0 (=107.0 K) than those of the films without the preannealing process. However, the homogeneity of the film seems to be slightly insufficient as the onset critical temperature of the real part of a complex susceptibility is about 3 K larger than Tc0.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104904
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  • 7
    Electronic Resource
    Electronic Resource
    Temporal evolution of dust grain-charge in a plasma (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 1048-1051 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Temporal and spatial evolution of the dust-charge in a low temperature plasma is demonstrated by numerical calculation. It is shown that the dust-charge number at the steady state obtained by the present calculation is in good agreement with that derived from an experiment of a direct current glow discharge. By changing the conditions, such as plasma and dust densities and ion and electron temperatures, their effects on the dust-charge are clarified by the present model. These are useful results for understanding the charging process of micron-sized dust grains in plasmas. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873351
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  • 8
    Electronic Resource
    Electronic Resource
    Stability of flow in a channel with a suddenly expanded part (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 8 (1996), S. 2933-2942 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The stability of a two-dimensional flow in a symmetric channel with a suddenly expanded part is investigated numerically and analyzed by using the method of the nonlinear stability theory. From results of the numerical simulation, it is shown that the flow is steady, symmetric and unique at very low Reynolds numbers, while the symmetric flow loses its stability at a critical Reynolds number resulting in an appearance of asymmetric flow. The transition from the steady symmetric flow to the steady asymmetric one is found to occur due to the symmetry breaking pitchfork bifurcation when the aspect ratio, the ratio of the length of the expanded part to its width, is large. It is also found that the bifurcated flow becomes symmetric again when the Reynolds number is increased and the resultant symmetric flow loses its stability becoming periodic in time as the Reynolds number is further increased. On the other hand, when the aspect ratio is small there occurs no pitchfork bifurcation and the direct transition from the steady symmetric flow to a periodic flow occurs due to a Hopf bifurcation. The critical aspect ratio is found to be about 2.3. The critical Reynolds numbers for these bifurcations are evaluated. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.869072
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  • 9
    Electronic Resource
    Electronic Resource
    Silver(I)-catalyzed rearrangement of bicyclobutanes. Mechanism. II (1971)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 93 (1971), S. 4611-4613 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00747a057
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  • 10
    Electronic Resource
    Electronic Resource
    Effects of B and C on the ordering of L10-CoPt thin films (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 2001-2003 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have investigated the effects of B and C on the ordering of L10-CoPt films and confirmed the following quite different role between B and C in CoPt. A small amount of B considerably decreases the temperature for ordering and is interstitially incorporated into L10-CoPt along its c axis due to the large negative heat of solutions with Co and Pt. X-ray photoelectron spectroscopy analyses have revealed that B atoms combine with Co and Pt. In contrast, C is not incorporated into the CoPt lattice due to its positive heat of solution, resulting in no decrease in the ordering temperature. The present results reveal that CoPt films containing a small amount of B are promising for high density recording media. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1408605
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