Abstract
The temperature dependence of the Δ 4 acoustic and optic mode, measured at q=(0.5,0,0) in LuNi 2B 2C, YNi 2B 2C were extended to 1000 K and new measurements on the mixed compound, Y 0.5Lu 0.5Ni 2B 2C, were undertaken to explore the mode coupling in these materials. The temperature behavior of each is different and cannot be explained by a simple mode coupling scheme of the acoustic and optic modes.
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