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Additional charge carriers were introduced to the iron oxyarsenideSr4Sc2Fe2As2O6 under a high-pressure condition, followed by measurements ofelectrical resistivity, Hall coefficient, and magnetic susceptibility. The hostcompound Sr4Sc2Fe2As2O6 shows metallic conductivity down to ~200 K and turns toshow a semiconducting-like conductivity accompanied by a positivemagneto-resistance (22% at 70 kOe). Although the carrier density is comparableat 300 K (5.9x1021 cm-3) with that of the other Fe-based superconductors, nosuperconductivity appears down to 2 K. This is primarily because the netcarrier density decreases over 3 orders of magnitude on cooling andadditionally a possible magnetic order at ~120 K prevents carriers frompairing. The properties were altered largely by introducing the additionalcarriers.

Magnetic and electrical properties and carrier doping effects on the Fe-based host compound Sr4Sc2Fe2As2O6