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  • American Institute of Physics (AIP)  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Interfacial reactions in the Zr–Si system studied by in situ transmission electron microscopy (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 4982-4987 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The interfacial reactions in the Zr–Si system have been studied by in situ cross-section transmission electron microscopy (TEM) including high-resolution-mode energy-dispersive spectroscopy (EDS) and nanobeam electron diffraction (nanodiffraction). The as-deposited Zr film has a columnar structure and an amorphous interlayer is observed at the Zr/Si interface. The amorphous layer is found to grow during annealing at 400 °C. The growth of the amorphous layer consists of three stages: a rapid increase in the early stage, a gradual increase in the intermediate metastable stage, and saturation in the final stage. The kinetics at each stage are discussed with in situ TEM observation and ex situ EDS analysis. Annealing at 500 °C creates a ZrSi2 layer at the amorphous layer/Si interface. The phase and orientation relationship are determined from the nanodiffraction patterns. The ZrSi2 is found to grow layer by layer into the Si substrate via a ledge mechanism. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359789
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Formation and control of two-dimensional deoxyribonucleic acid network (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 3848-3850 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Recently, we have successfully fabricated large-scale deoxyribonucleic acid (DNA) networks on mica surfaces using a simple fabrication method. This report describes how we fabricated a variety of structures depending on the type of DNA, and controlled these structures using a post-treatment ethanol which we observed using atomic force microscopy. We found that the height of fiber in the DNA network depended on the type of DNA and its original length, and that the fiber height and mesh diameter could be shortened and widened, respectively, with ethanol treatment. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1330565
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The role of dimer formation in the self-assemblies of DNA base molecules on Cu(111) surfaces: A scanning tunneling microscope study (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 3419-3423 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: For the purpose of understanding the self-assembly formation mechanism of DNA base molecules, guanine, adenine, cytosine, and thymine molecules were deposited on Cu(111) surfaces, and were observed using a low-temperature ((approximate)80 K) scanning tunneling microscope (STM). Single-molecular-scale STM images revealed that guanine, adenine, and cytosine molecules can form ordered one- and/or two-dimensional unique structures, but thymine molecules, however, randomly aggregate into small clusters. Semiempirical molecular orbital (MO) calculation indicates that there exists predominantly stable dimer structures for the former three molecules, while such phenomena cannot be observed among the possible thymine dimer and even trimer structures. Based on experimental and theoretical results, we have concluded that specific hydrogen-bonded nucleus formation is a decisive process in the two-dimensional self-assembly formation of DNA base molecules on Cu(111) surfaces. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1384551
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  • 4
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    High-Tc Phase of PrO0.5F0.5BiS2 single crystal induced by uniaxial pressure (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-08-09
    Description: We demonstrated a pressure-induced phase transition from a low- T c phase (3.5 K) to a high- T c phase (8.7 K) in single crystalline PrO 0.5 F 0.5 BiS 2 . The high- T c phase is easily observed even at 0.7 GPa by uniaxial pressure obtained from a geometric effect of a single crystal with an extremely thin thickness. For this phase transition, superconducting anisotropy and the coherence length along the c axis change from γ =  20 to 9.3 and from ξ c  = 0.56 to 0.71 nm, respectively. It is suggested that a shrinkage in the c lattice constant by applied uniaxial pressure enhances the three dimensionality in the superconducting state.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 5
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    The effect of exceptionally high fluorine doping on the anisotropy of single crystalline SmFeAsO1−xFx (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-09-12
    Description: We prepared single crystalline SmFeAsO 1− x F x with an exceptionally high fluorine concentration by using a CsCl flux method. Comparing to conventional flux methods, this method can introduce about double the amount of fluorine into the oxygen site. The obtained single crystal shows the highest superconducting transition temperature ( T c  = 57.5 K) in single crystalline iron pnictides. In addition, the residual resistivity ratio is almost three times as large as that of previously reported single crystals. This suggests that our single crystals are suitable for investigation of the intrinsic superconducting properties, since they have few defects and impurities. Using both the Werthamer-Helfand-Hohenberg model and the effective mass model, we demonstrated that a higher fluorine concentration suppresses the anisotropic superconductivity of SmFeAsO 1− x F x .
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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