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We report measurements of the resistivity, thermopower, thermal conductivity, Hall coefficient, and magnetic susceptibility of RuAl 2 over a wide temperature range. Room-temperature sound velocity measurements are also reported. We find that at low temperature RuAl 2 behaves as a low carrier-density semimetal. As the temperature is raised, excitations across a 0.6-eV pseudogap dominate the transport, and RuAl 2 behaves effectively as a semiconductor. The diamagnetic susceptibility of RuAl 2 isdoi:10.1103/physrevb.58.3712 fatcat:k64jgtrbmzf2zgenqzpqtxvdvq