engleski

Anisotropic Hall effect of the approximants to decagonal quasicrystals

The Hall coefficient RH in monoclinic Y-Al-Ni-Co[1, 2], orthorhombic o-Al13Co4[3] and monoclinic m-Al13Fe4 and m-Al13(Fe, Ni)4[4] single crystals has been investigated for all combinations of the electrical current and magnetic field directions and in the temperature interval from 90 to 370 K. In all three intermetallics, which belong to the Al13TM4 (TM = transition metal) class of approximants to the decagonal quasicrystals, the Hall coefficient exhibits well defined anisotropy. RH is positive hole-like or zero for the magnetic field parallel to the plane that corresponds to the quasiperiodic plane in decagonal (d) quasicrystals, and is negative electron-like or zero for the magnetic field perpendicular to this plane. The only exeption is RH in Al13Fe4 for the field parallel to the stacking direction, which changes the sign from positive to negative value with the increase of temperature. The results for the anisotropy of RH are correlated to the anisotropy of RH in d-Al-Ni-Co and d-Al-Cu-Co quasicrystals and a brief overview of the theoretical results is presented [6]. [1] A. Smontara et al., Phys. Rev. B 78 (2008) 104204-1-13. [2] D. Stanić et al., Croat. Chem. Acta 83 (2010) 1-5. [3] J. Dolinšek et al., Phys. Rev. B 79 (2009) 184201-1-12. [4] P. Popčević et al., Phys. Rev. B 81 (2010) 184203-1-12. [5] M. Heggen et al., Phys. Rev. B 81 (2010) 184204-1-11. [6] J. Ivkov et.al., Phil. Mag. in press.

complex metallic alloys ; Hall effect ; anisotropy ; approximants

The paper was presented at the First European Integrated Center for the Development of New Metallic Alloys and Compounds Days (C-MAC) as a talk by Denis Stanić. This work was done within the activities of the European Integrated Center for the Development of New Metallic Alloys and Compounds - C-MAC.