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Anisotropic Transport Properties of Decagonal Quasicrystals and Their Periodic Approximants

Crystallographic structures of decagonal quasicrystals (d-QCs) are described as a periodic stacking of atomic planes with quasiperiodic in-plane atomic order. The stacked-layer structures are observed also in the periodic decagonal approximant phases. In this talk, we consider the anisotropy in the physical properties in the d-QCs and their periodic approximants on the basis of the measurements of the transport coefficients (electrical resistivity, thermopower, and Hall coefficient and thermal conductivity). By comparing the anisotropic transport coefficients along the stacking- and the in-plane directions of a series of decagonal approximants with different number of atomic layers within one periodicity unit ; (the two-layer Y-Al-Co-Ni [1] ; the four-layer o-Al13Co4 [2] , Al13Fe4 and Al13(Fe, Ni)4 [3] ; the six-layer Al4(Cr, Fe)[4] and T-Al3(Mn, Fe))[5] with that of a two-layer d-Al-Co-Ni decagonal quasicrystal[6-8], we show the universality that the stacking direction perpendicular to the atomic planes is always the most conducting one for both the electricity and heat, along the stacking direction, whereas the in-plane anisotropy is considerably smaller or negligible.[5, 7-8] 1. A. Smontara et al., Phys. Rev. B 78 (2008) 104204 2. J. Dolinšek et al., Phys. Rev. B 79 (2009) 184201 3. P. Popčević et al., Phys. Rev. B 81 (2010) 184203 4. J. Dolinšek et al., Phys. Rev. B 76 (2007) 174207 5. M. Heggen et al., Phys. Rev. B 81 (2010) 184204 6. A. Smontara et al., C-MAC Days, Dresden, 2010 7. A. Smontara et.al., Philos. Mag. 91 (2011) 27467 8. P. Popčević et al., The Israel Journal of Chemistry 51 (2011) 075157 9. B. Bobnar et al, Phys. Rev. B 85 (2012) 024205.

quasicrystals; transport properties

The poster was presented by Ante Bilušić. This work was done within the activities of the European Integrated Center for the Development of New Metallic Alloys and Compounds - C-MAC.