Electronic transport in Cd–Yb and Y–Mg–Zn quasicrystals

Pope, A. L.; Tritt, T. M.; Gagnon, R.; Strom-Olsen, J.
October 2001
Applied Physics Letters;10/8/2001, Vol. 79 Issue 15, p2345
Academic Journal
Electronic transport properties of the stable binary Cd[sub 5.7]Yb quasicrystal and a quasicrystal in the Y–Mg–Zn family is presented. Electrical conductivity in these systems is an order of magnitude higher than other quasicrystals, resulting in larger thermal conductivity values due to enhanced electronic contributions (λ[sub E]=L[sub 0]σT). Room temperature Hall measurements provide a charge carrier density of 2.3×10[sup 21] and 3.1×10[sup 20] cm[sup -3] in Cd[sub 5.7]Yb and Y–Mg–Zn, respectively, indicating these materials have a higher carrier concentration and are better conductors than other quasicrystalline counterparts. Thermoelectric power in both Cd[sub 5.7]Yb and Y–Mg–Zn have relatively small magnitudes (16 and 8 μV/K, respectively). Despite many similarities between these two systems, low temperature specific heat reveals a low Debye temperature in Cd[sub 5.7]Yb(140 K) while the Debye temperature of Y–Mg–Zn and other quasicrystals is at least twice as large. Consequences of the electrical transport in these systems will be discussed. © 2001 American Institute of Physics.


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