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We performed high-pressure transport measurements on high-quality singlecrystals of KOs2O6, a beta-pyrochlore superconductor. While the resistivity athigh temperatures might approach saturation, there is no sign of saturation atlow temperatures, down to the superconducting phase. The anomalous resistivityis accompanied by a nonmetallic behavior in the thermoelectric power (TEP) upto temperatures of at least 700 K, which also exhibits a broad hump with amaximum at 60 K. The pressure influences mostly the low-energy electronicexcitations. A simple band model based on enhanced density of states in anarrow window around the Fermi energy (EF) explains the main features of thisunconventional behavior in the transport coefficients and its evolution underpressure.

Manifestations of fine features of the density of states in the transport properties of KOs2O6