Yazar "Ekmekci, S." seçeneğine göre listele

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  • Küçük Resim Yok
    Öğe
    Alternating Heisenberg s=1/2 spin chain
    (Natl Inst Optoelectronics, 2006) Isik, F.; Ekmekci, S.; Bayri, A.
    Spin ladder systems containing CuCl3 and CuBr3 show very interesting magnetic behaviour, which are alternate Heisenberg chains with ferromagnetic and antiferromagnetic interactions. Since these systems contain triangles of magnetic centers, we developed a model based on non-interacting triangular units, which may be used for interpretation of magnetic measurements of these systems in some extreme limits. We took the Heisenberg model type interactions for magnetic center and used different types of exchange coupling between the neighbours. The results obtained from our approximations may be used in order to interpret the experimental magnetic measurements in KCuCl3 and TiCuCl3 complexes and for the singlet-triplet transition temperature.
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    Öğe
    An energy competition of Co3+ and Co4+ ions during spin state transition in Ca3Co4O9 complex
    (Iop Publishing Ltd, 2016) Karaman, N.; Bayri, A.; Ekmekci, S.
    The magnetic behavior of Ca3Co4O9 complex shows a very interesting phase transition at high temperature. It is probably that this ordering is due to the spin states of Co3+ and Co4+ ions. It is quite obvious that spin states of Co ions generally change as a function of temperature. We have shown that there is a strong correlation between oxidation states and ligand field parameters during spin state transitions.
  • Küçük Resim Yok
    Öğe
    Symmetry related magnetic interactions in (CuCl3) complexes
    (İnönü Üniversitesi, Fen Edebiyat Fakültesi, Fizik Bölümü, Malatya, Türkiye, 2001) Atalay, F.E; Bayri, A.; Ekmekci, S.
    Abstract: CuCl3 komplekslerinde ferromagnetik ve antiferromagnetik iki tür magnetik etkileşimin olduğu bildirilmiştir. Bu etkileşimler exchange sabitinin işareti ile birbirlerinden tamamen ayrılırlar .Bu kompleksin moleküler orbitallerini bulmak için, molekülün lokal simetrisini kullandık. Bu orbitalleri kullanarak her iki yöndeki exchange sabitini hesapladık.