Magnetic and electrical properties and carrier doping effects on the iron-based host compound Sr2ScFeAsO3

作者：Zhang S B^*; Guo Y F; Shi Y G; Yu S; Li J J; Wang X X; Arai M; Yamaura K; Takayama Muromachi E

来源：Physical Review B, 2011, 83(2): 024505.

DOI：10.1103/PhysRevB.83.024505

Additional charge carriers were introduced to the iron oxyarsenide Sr2ScFeAsO3 under a high-pressure condition, followed by measurements of electrical resistivity, the Hall coefficient, and magnetic susceptibility. The host compound Sr2ScFeAsO3 shows metallic conductivity down to similar to 200 K and turns to show a semiconducting-like conductivity accompanied by a positive magnetoresistance (22% at 70 kOe). Although the carrier density is comparable at 300 K (5.9 x 10(21) cm(-3)) with that of the other Fe-based superconductors, no superconductivity appears down to 2 K. This is primarily because the net carrier density decreases over three orders of magnitude on cooling and additionally a possible magnetic order at similar to 120 K prevents carriers from pairing. The properties were altered largely by introducing the additional carriers.

• 出版日期2011-1-19