Physics / Fizik

Permanent URI for this collectionhttps://hdl.handle.net/11147/6

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End date: 2009Publisher: search.filters.publisher.Elsevier

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  • Article
    Citation - WoS: 38
    Citation - Scopus: 40
    Influences of Deposition Time and Ph on Magnetic Nife Nanowires Fabrication
    (Elsevier, 2009) Atalay, Funda E.; Kaya, Harun; Atalay, Selcuk; Tarı, Süleyman
    In this work, NiFe nanowires were grown into highly ordered porous anodic alumina oxide (AAO) templates by dc electrodeposition at various deposition times and pH values. During the deposition process some electrochemical bath parameters such as ion content, deposition voltage, and temperature of solution were kept constant. The morphological properties of the nanowire arrays were studied by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), the chemical composition was determined by examination of the energy dispersive X-ray (EDX) spectra, and the magnetic behavior of the arrays was determined by vibrating sample magnetometer (VSM). (C) 2008 Elsevier B.V. All rights reserved.
  • Conference Object
    Citation - WoS: 22
    Citation - Scopus: 23
    A Symmetry for Vanishing Cosmological Constant in an Extra-Dimensional Toy Model
    (Elsevier, 2005) Erdem, Recai
    We introduce a symmetry principle that forbids a bulk cosmological constant in six and ten dimensions. Then the symmetry is extended in six dimensions so that it insures absence of 4-dimensional cosmological constant induced by the six-dimensional curvature scalar, at least, for a class of metrics. A small cosmological constant may be induced in this scheme by breaking of the symmetry by a small amount.
  • Article
    Citation - WoS: 16
    Citation - Scopus: 17
    Superconducting Gap and Pseudogap From Tunneling Conductance on Bi2sr2cacu2og+δ With Various Oxygen Concentration
    (Elsevier, 2000) Miyakawa, N.; Zasadzinski, J.F.; Ozyuzer, L.; Guptasarma, P.; Kendziora, C.; Hinks, D.G.; Gray, K.E.
    The evolution of tunneling spectra on Bi2Sr2CaCu2Og+δ measured by SIN point contacts, SIS break junctions and STM/STS has been studied as a function of doping and temperature. The detailed examinations of the spectra show that the energy gap measured at low temperature appear to be due to superconducting pairing. The doping dependence of the superconducting gap at low temperature suggests a strong connection to the pseudogap temperature, T*, and this indicates that the pseudogap region is at least partly a consequence of some form of precursor superconductivity. In addition, dip/hump structures observed at high bias scale approximately with not only Δ but also superexchange interaction J over the entire doping range examined, indicating these features are linked to the underlying interaction responsible for superconductivity. We suggest that the hump structure may originate from short-range magnetic correlations. © 2000 Elsevier Science B.V All rights reserved.