Browsing by Author "Gedik, Zafer"

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    Local-pair superconductivity in very high magnetic fields
    (Scientific and Technical Research Council of Turkey - TUBITAK,Turkiye Bilimsel ve Teknik Arastirma Kurumu, 1996) Gedik, Zafer
    Superconductivity of narrow-band systems with local, short-range attractive interaction in very high magnetic fields is discussed. By examining the excitation spectra of both type-II superconductors with BCS like interaction and local-pair superconductors with negative-U type interaction, it is concluded that gapless single particle energy spectrum is a characteristic feature of superconductivity in very high magnetic fields.
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    Superconductivity in ultrasmall metallic particles
    (Springer, 2000) Boyacı, Hüseyin; Gedik, Zafer; Kulik, Igor O.; Kulik, Igor O.; Ellialtıoğlu, Recai
    Recent single electron transport experiments in nanometer size samples renewed the question about the lower limits of the size of superconductors, and the crossover from superconducting to normal state. In order to give answers to these questions, a pairing Hamiltonian for fixed number of particles is studied including the degeneracy of levels around the Fermi energy. For d-fold degenerate states we find that the ratio of two successive parity parameters Δ p is nearly 1 + l/d.