| Autor: |
Jazbec, S., Koželj, P., Vrtnik, S., Jagličić, Z., Popčević, Petar, Ivkov, Jovica, Stanić, Denis, Smontara, Ana, Feuerbacher, M., Dolinšek, J. |
| Jazyk: |
angličtina |
| Rok vydání: |
2012 |
| Předmět: |
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| Popis: |
We report electrical, magnetic and thermal properties of the δ-FeZn10 phase in the zinc-rich domain of the Fe–Zn system. The δ-FeZn10 phase possesses high structural complexity typical of complex metallic alloys: a giant unit cell comprising 556 atoms, a polyhedral atomic order with icosahedrally-coordinated environments, fractionally occupied lattice sites and statistically disordered atomic clusters that introduce intrinsic disorder into the structure. Structural disorder results in suppression of the electrical and heat transport phenomena, making δ-FeZn10 poor electrical and thermal conductor. Structural complexity results in complex electronic structure that is reflected in the opposite signs of the thermoelectric power and the Hall coefficient. The δ-FeZn10 phase is paramagnetic down to the lowest investigated temperature of 2 K with a significant interspin coupling of an antiferromagnetic type. Specific heat indicates the formation of short-range-ordered spin clusters at low temperatures, very likely a precursor of a phase transition to a collective magnetic state that would take place below 2 K. The magnetoresistance of δ-FeZn10 is sizeable, amounting 1.5 % at 2 K in 9 T field. The electrical resistivity exhibits a maximum at about 220 K and its temperature dependence could be explained by the theory of slow charge carriers, applicable to metallic systems with weak dispersion of the electronic bands, where the electron motion changes from ballistic to diffusive upon heating. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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