Two single crystalline samples with the same nominal composition of Rb 0.8Fe2Se2 prepared via slightly different precursor routes under the same thermal processing conditions were investigated at ambient and high pressures. One sample was found superconducting with a Tc of ∼31 K without the previously reported resistivity hump, and the other was unexpectedly found to be a narrow-gap semiconductor. While the high pressure data can be understood in terms of pressure-induced variation in doping, the detailed doping effect on superconductivity is yet to be determined.
|期刊||Physical Review B - Condensed Matter and Materials Physics|
|出版狀態||Published - 2011 十一月 15|
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