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Hall Effect of the Al₁₃Fe₄ Decagonal Approximant and Its Ternary Extension Al₁₃(Fe,Ni)₄

Jovica Ivkov ; Laboratory for the Physics of Transport Phenomena, Institute of Physics, Bijenička 46, P. O. Box 304, HR-10001 Zagreb, Croatia
Petar Popčević ; Laboratory for the Physics of Transport Phenomena, Institute of Physics, Bijenička 46, P. O. Box 304, HR-10001 Zagreb, Croatia
Janez Dolinšek ; Jožef Stefan Institute, University of Ljubljana, Jamova 39, SI-1000 Ljubljana, Slovenia
Peter Gille ; Ludwig-Maximilians-Universität München, Department of Earth and Environmental Sciences, Crystallography Section, Theresienstrasse 41, D-80333 München, Germany

Sažetak

We have measured Hall coefficient and electrical resistivity of the Al₁₃Fe₄ and Al₁₃(Fe,Ni)₄ monoclinic approximants to the decagonal quasicrystal. While the Al₁₃Fe₄ crystals are structurally well ordered, the ternary extension Al₁₃(Fe,Ni)₄ contains quenched disorder and can be viewed as a disordered version of Al₁₃Fe₄. The crystallographic-direction-dependent Hall effect measurements were performed along the a*, b and c directions of the monoclinic unit cell, where (a*,c) atomic planes are stacked along the perpendicular b direction. The stacking b direction is the most conducting direction for the electricity. The effect of quenched disorder in Al₁₃(Fe,Ni)₄ is manifested in the large residual resistivity ρ(T → 0) as compared to the ordered Al₁₃Fe₄. The Hall coefficient, R_H, values for all combinations of directions, are typical metallic. The anisotropic Hall coefficient reflects complicated structure of the anisotropic Fermi surface that contains electron-like and hole-like parts. Depending on the combination of directions of the current and magnetic field electron-like (R_H < 0) or hole-like (R_H > 0) contributions may dominate, or the two contributions compensate each other (R_H ≈ 0).

Ključne riječi

complex metallic alloys; decagonal approximants; Hall effect; electrical resistivity

Hrčak ID:

52244

URI

https://hrcak.srce.hr/52244

Datum izdavanja:

30.4.2010.

Posjeta: 1.303 *