Origin of the Hall-coefficient anisotropy in the Y-Al-Ni-Co decagonal approximantby thermal treatment (CROSBI ID 135736)
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Komelj, M. ; Ivkov, Jovica ; Smontara, Ana ; Gille, P. ; Dolinšek, J.
engleski
Origin of the Hall-coefficient anisotropy in the Y-Al-Ni-Co decagonal approximantby thermal treatment
We present an experimental and theoretical study of the anisotropic Hall coefficient of Y-Al-Ni-Co decagonal approximant with composition Al76Co22Ni2. Performing ab-initio calculation of , we reproduced quantitatively the experimentally observed anisotropy for all combinations of crystalline directions of the electric current and magnetic field. The origin of the anisotropic Hall coefficient is the anisotropic Fermi surface, the anisotropy of which originates from the specific stacked-layer structure of the Y-Al-Ni-Co compound and the chemical decoration of the lattice. Due to structural similarity of Y-Al-Ni-Co to the d-Al-Ni-Co-type decagonal quasicrystals, the same physical picture also explains the universal anisotropy of this family of quasicrystals, where changes sign along different crystalline directions.
decagonal quasicrystals; Hall-coefficient; anisotropy
This work was supported in a part by the 6th Framework EU Network of Excellence 'Complex Metallic Alloys' (Contract No. NMP3-CT-2005-500140).
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