1. Magnetic and electrical properties and carrier doping effects on the iron-based host compound Sr2ScFeAsO3.
- Author
-
Zhang, S. B., Guo, Y. F., Shi, Y. G., Yu, S., Li, J. J., Wang, X. X., Arai, M., Yamaura, K., and Takayama-Muromachi, E.
- Subjects
- *
IRON , *MAGNETIC properties , *CARRIER density , *SEMICONDUCTOR doping , *SUPERCONDUCTORS , *MAGNETORESISTANCE - Abstract
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 ∼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 × 1021 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 ∼120 K prevents carriers from pairing. The properties were altered largely by introducing the additional carriers. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF