Anisotropic magnetic and transport properties of the orthorhombic Al13Co4 decagonal approximant (CROSBI ID 144373)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Dolinšek, J. ; Komelj, M. ; Jeglič, P. ; Vrtnik, S. ; Stanić, Denis ; Popčević, Petar ; Ivkov, Jovica ; Smontara, Ana ; Jagličić, Z. ; Gille, P. ; Grin, Yu Y.
engleski
Anisotropic magnetic and transport properties of the orthorhombic Al13Co4 decagonal approximant
We have investigated anisotropic physical properties (magnetic susceptibility, electrical resistivity, thermoelectric power, Hall coefficient and thermal conductivity) of the o-Al13Co4 orthorhombic approximant to the decagonal phase. The crystalline-direction-dependent measurements were performed along the a, b and c directions of the orthorhombic unit cell, where (b, c) atomic planes are stacked along the perpendicular a direction. Magnetic susceptibility is predominantly determined by the Pauli spin paramagnetism of conduction electrons. The in-plane magnetism is stronger than that along the stacking a direction. Anisotropic electrical and thermal conductivities are the highest along the stacking a direction. The anisotropic thermoelectric power changes sign with the crystalline direction and so does the anisotropic Hall coefficient, which changes from negative electron-like to positive hole-like for different combinations of the electric current and magnetic field directions. The investigated anisotropic electrical and thermal transport coefficients were reproduced theoretically by ab-initio calculation using Boltzmann transport theory and the calculated anisotropic Fermi surface. The calculations were performed for two existing structural models of the o-Al13Co4 phase, where the more recent model gave better agreement, though still qualitative only, to the experiments. The physical properties of the o-Al13Co4 phase were compared to the literature data on two related decagonal approximant phases, the Y-Al-Ni-Co and the Al4(Cr, Fe), allowing for a study of the evolution of physical properties with increasing structural complexity and unit cell size. A comparison of the decagonal approximant phases to the decagonal Al-Ni-Co-type quasicrystals was made, too.
61.44.Br; 71.23.Ft
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Podaci o izdanju
79 (18)
2009.
184201-1-184201-12
objavljeno
1098-0121
10.1103/PhysRevB.79.184201