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  • 1
    Electronic Resource
    Electronic Resource
    Apparatus for deformation tests of solids in liquid 3He (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 2833-2838 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An apparatus for deformation of solids in liquid 3He is constructed. Either tensile deformation or compression of a specimen can be performed by exchanging the assemblies in the 3He pot which has a capacity of about 30 cm3. The pulling rod for transmitting load from the tensile testing machine to the specimen runs inside the outlet tube of 3He, being isolated from 4He bath and almost free from mechanical friction. To measure the change in flow stress with the supernormal transition of superconducting metals, a superconducting magnet is mounted outside of the vacuum chamber which separates the 3He pot and the 4He bath. Under an applied load for plastic deformation the system is stably operative down to 0.6 K, while the lowest temperature achieved is 0.5 K. Some results on Ta and NaCl are presented. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150699
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  • 2
    Electronic Resource
    Electronic Resource
    Theoretical study of the valence π→π* excited states of polyacenes: Benzene and naphthalene (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 6244-6258 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Multireference perturbation theory with complete active space self-consistent field (CASSCF) reference functions was applied to the study of the valence π→π* excited states of benzene and naphthalene. The eigenvectors and eigenvalues of CASSCF with valence π active orbitals satisfy pairing properties for the alternant hydrocarbons to a good approximation. The excited states of polyacenes are classified into the covalent minus states and ionic plus states with the use of the alternancy symmetry. The present theory satisfactorily describes the ordering of low-lying valence π→π* excited states. The overall accuracy of the present approach is surprisingly high. We were able to predict the valence excitation energies with an accuracy of 0.27 eV for singlet u states and of 0.52 eV or better for singlet g states of naphthalene. Our predicted triplet states spectrum provides a consistent assignment of the triplet–triplet absorption spectrum of naphthalene. For benzene we were able to predict the valence excitation energy with an accuracy of about 0.29 eV. The covalent minus states and ionic plus states exhibit different behavior as far as the electron correlation is concerned. The ionic plus states are dominated by the single excitations but covalent minus states include a large fraction of doubly excited configurations. The covalent minus states always give lower energy than the corresponding ionic plus states. This is true for triplet states. The dynamic σ–π polarization effects introduced by perturbation theory are significant for the ionic plus states while those on covalent excited states are usually of the same order as in the covalent ground state. The enlargement of the active space of the reference functions represents a great improvement of the description of the ionic states. The present approach with the pairing properties has proved to be of great value in understanding and predicting the experimental data of the alternant hydrocarbons. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471286
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetization curling in films used for perpendicular magnetic recording (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 3593-3597 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetization-curling mode in a columnar-structure film with perpendicular magnetization is studied on the assumption that the film is a two-dimensional array of cylinders. The angular dependence of the nucleation field HN is calculated by the Ritz method and compared with that for the coherent-rotation mode. It is found that the magnetization rotates in the curling mode for a large reduced radius S and in the coherent-rotation mode for a small S. The angular dependence of HN is different from that in an infinite cylinder. If S is large, the magnetization rotates in the curling mode for any value of θ0, where θ0 is the angle between the applied field and the cylinder axis. When S is medium, the magnetization rotates in the coherent-rotation mode for a small θ0 and in the curling mode for a large θ0. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365678
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  • 4
    Electronic Resource
    Electronic Resource
    Heat capacity of ternary compounds RNiGe(R=Gd, Dy, Er, and Y) (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 7410-7412 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The heat capacity of the ternary compounds RNiGe(R=Er, Dy, Gd, and Y) was studied in the temperature range between 2 and 40 K. From the heat capacity curves, Néel temperatures are found to be 3.3, 7.4, and 10.7 K for ErNiGe, DyNiGe, and GdNiGe, respectively. The heat capacity of YNiGe was well fitted with an average Debye temperature of 272 K in the temperature range between 2 and 40 K. The changes of magnetic entropy indicate a strong influence of the crystal field on the Er+3 and Dy+3 ion in ErNiGe and DyNiGe compounds. These results suggest the possibility of using these compounds as magnetic regenerator materials near the temperature of 4.2 K. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360395
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  • 5
    Electronic Resource
    Electronic Resource
    Specific heat behavior for pseudobinary compounds ErxDy1−xSb (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 2214-2216 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: To search the new magnetic regenerator materials in the temperature range near 4 K, specific heat behavior of pseudobinary compounds ErxDy1−xSb(x=0, 0.2, 0.6, 0.8, and 1) was studied at temperatures from 2 to 40 K. The ordering temperature shifts from 3.5 to 9.5 K with increasing the concentration of the Dy+3 ion. The compounds of 1(approximately-greater-than)x(approximately-greater-than)0 show the gradual magnetic phase transition. The change of entropy associated with the magnetic phase transition is close to R ln 2 for all compounds. The change of magnetic entropy up to 40 K increases rapidly with decreasing the concentration of the Dy+3 ion, which implies that more excited states exist. The compounds of lower concentration of the Dy+3 ion have properties well suited for magnetic regenerative material around the temperature range of 4 K. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358805
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  • 6
    Electronic Resource
    Electronic Resource
    Phase separation in deuterated polycarbonate/poly(methylmethacrylate) blend near glass transition temperature (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 2095-2100 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Early stage of spinodal decomposition kinetics of deuterated polycarbonate/poly(methylmethacrylate) blend has been studied by the time resolved small angle neutron scattering measurements. A trapped miscible state was obtained through fast solution casting of film specimens. Time dependence of the structure factor, S(q,t), was measured after the specimen temperature was quickly increased to a final temperature which is above its glass transition temperature, Tg. Thus, the early stage of spinodal decomposition kinetics has been observed starting from the dimension (q−1) comparable to the single chain radius of gyration, Rg, for a binary polymer mixture. The results provide an unequivocal quantitative measure of the virtual structure factor, S(q,∞); the relationship of qm and qc through rate of growth, Cahn-plot analysis, and singularity in S(q,∞); the growth of fluctuation of qRg〈1 and intrachain relaxation of qRg(approximately-greater-than)1; and also a clear proof of the Cahn–Hillard–Cook theory in the early stage of spinodal decomposition of a mean-field system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465275
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  • 7
    Electronic Resource
    Electronic Resource
    New application of complex magnetic materials to the magnetic refrigerant in an Ericsson magnetic refrigerator (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 3873-3878 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A complex new magnetic refrigerant, suitable for the ideal Ericsson cycle, has been investigated. Above ∼15 K it is necessary to use ferromagnets as a magnetic refrigerant. However, temperature variation for the magnetic entropy change in a homogeneous ferromagnet is not suitable for the Ericsson cycle. The present paper verifies, from theoretical analysis, that a complex ferromagnetic material, for instance, (ErAl2)0.312(HoAl2)0.198 (Ho0.5Dy0.5Al2)0.490, has the most suitable characteristics for the ideal Ericsson cycle, including two kinds of isomagnetic field processes. On the basis of the above consideration, a sintered layer structural complex has been prepared, composed of three kinds of RAl2.15 layers, where R's are rare-earth atoms. From specific heat measurements made on this complex, its entropy and entropy change have been determined. It has been concluded that the complex magnetic material is the most hopeful refrigerant for the Ericsson cycle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339232
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  • 8
    Electronic Resource
    Electronic Resource
    Response to "Comment on ‘Electron holographic study of ferroelectric domain wells' '' (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 2447-2447 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109341
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  • 9
    Electronic Resource
    Electronic Resource
    Electron holographic study of ferroelectric domain walls (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 784-786 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electron holography performed in a transmission electron microscope, has been used to measure the width of 90° domain walls in tetragonal BaTiO3, and to determine the magnitude and distribution of the polarization across these walls. The walls are found to be between 15 and 25 A(ring) in width. The polarization and its measured variation are in good agreement with other estimates. Fringe splitting has been observed in some holograms and it is suggested that this is due to the presence of charged oxygen vacancies on the walls.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.106519
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  • 10
    Electronic Resource
    Electronic Resource
    Small-astigmatism, low-noise, and high-power self-sustained pulsation multiple-quantum-well laser diodes with a real refractive index guided self-aligned structure (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 3656-3658 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We demonstrated low-noise and high-power GaAlAs laser diodes with small astigmatism. The low-noise characteristics are realized by self-sustained pulsation due to the saturable absorption of a single-quantum-well located close to the triple-quantum-well active layer. The high-power and small-astigmatism characteristics are achieved by using a real refractive index guided self-aligned structure. The lasers showed a relative intensity noise less than −130 dB/Hz under 10% optical feedback in a very wide output-power range (5–35 mW), a stable fundamental transverse mode up to 150 mW, and astigmatism less than 1 μm. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117014
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