Naslov
Physical properties of the Al13Fe4 and Al13(Fe, Ni)4 complex metallic alloys

Autori
Vrtnik, S ; Wencka, M. ; Jeglič, P. ; Jagličić, Z. ; Smontara, Ana ; Gille, P. ; Dolinšek, J.

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
C-MAC Days, European Integrated Center for the Development of New Metallic Alloys and Compounds, Industry Days and Workshop Sessions, Program and Abstracts / - Dresden, 2010

Skup
European Integrated Center for the Development of New Metallic Alloys and Compounds (C-MAC) Days

Mjesto i datum
Dresden, Njemačka, 15.11.2010. - 18.11.2010

Vrsta sudjelovanja
Pozvano predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
complex metallic alloys; electrical resistivity; thermal conductivity;

Sažetak
We have investigated physical properties (magnetic susceptibility, electrical resistivity, thermoelectric power, Hall coefficient and thermal conductivity) of the Al13Fe4 and Al13(Fe, Ni)4 complex metallic alloys. Single crystals belong to the Al13TM4 (TM = transition metal) family of four-layer decagonal approximants and were grown by the Czochralski technique [1]. While Al13Fe4 reveals a nearly completely ordered crystal structure (all atomic sites have occupancy 1) [2], the ternary derivative Al13(Fe, Ni)4 contains substitutional disorder and is considered a disordered version of the Al13Fe4. Single crystals were cut to bar-shaped samples along the a*, b and c direction of the monoclinic unit cell, where the (a*, c) atomic planes are stacked along the b direction. The magnetic properties and electronic transport exhibit significant anisotropy with the most conducting direction (for the electricity and heat) along the b direction. The effect of substitutional disorder in Al13(Fe, Ni)4 is manifested in the large residual resistivity ρ(T→0) and significantly reduced thermal conductivity of this compound, as compared to the ordered Al13Fe4. Specific-heat measurements reveal that the electronic density of states at the Fermi level of both compounds is high. The anisotropic Hall coefficient RH reflects complex structure of the anisotropic Fermi surface that contains electronlike and holelike contributions. Similar complicated anisotropic behavior was observed also in the thermopower.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
This work was done within the activities of the European Integrated Center for the Development of New Metallic Alloys and Compounds - C-MAC.

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