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Magnetic and transport properties of δ-Zn10Fe

We have studied magnetic susceptibility, electrical resistivity, thermoelectric power, thermal conductivity, specific heat and Hall coefficient of a phase (δ) that exists in Zn-rich part of Zn-Fe system. This phase crystallizes in hexagonal space group P63/mmc with unit cell parameters a=12.787(3) Å, c=57.222(7) Ǻ and 556 atoms in unit cell [1]. The sample was a single crystal and magnetic susceptibility measurements reveal that it is a paramagnet without any hysteresis in magnetization curve. The electrical resistivity amount to about 190 cm at the room temperature. It is a metallic like with relatively large residual resistivity at low temperatures and positive temperature coefficient, but tends to saturate at room temperature. Low-temperature specific heat in C/T versus T2 plot shows an increase in C/T below 8 K, that is frequently observed in heavy fermion systems. The thermoelectric power is small (<4 μV/K) and negative with complicated temperature behaviour (local minimum around 70 K an maximum around 150 K). The thermal conductivity is anomamalolously low (<10 W/mK) for an alloy of metallic elements. Hall coefficient is positive and increases significantly with temperature at lower temperatures, while exhibiting a tendency to saturate at temperatures above the room temperature. Such temperature behaviour could be attributed to the anisotropy of electron scattering times [2]. [1] C.H.E. Belin, R.C.H. Belin, J. Sol. Stat. Chem. 151 (2000) 85 [2] P. Popčević et al., Phys. Rev. B 81 (2010) p.184203.

delta FeZn10

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