Physics – Condensed Matter – Superconductivity
Scientific paper
2010-12-03
Physics
Condensed Matter
Superconductivity
22 pages, 9 figures, 1 table, 41 references, accepted Phys. Rev. B 2010
Scientific paper
Additional charge carriers were introduced to the iron oxyarsenide Sr4Sc2Fe2As2O6 under a high-pressure condition, followed by measurements of electrical resistivity, Hall coefficient, and magnetic susceptibility. The host compound Sr4Sc2Fe2As2O6 shows metallic conductivity down to ~200 K and turns to show a semiconducting-like conductivity accompanied by a positive magneto-resistance (22% at 70 kOe). Although the carrier density is comparable at 300 K (5.9x1021 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 3 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.
Arai Masato
Guo Y. F.
Li Jiying
Shi Y. G.
Takayama-Muromachi Eiji
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