Zero-resistance superconducting phase in BaFe2As2 under high pressure
Zero-resistance superconducting phase in BaFe2As2 under high pressure
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DOI：
10.1103/physrevb.79.172506
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发表时间：
2009-05-01
影响因子：
3.7
通讯作者：
Yamada, Yuh
中科院分区：
文献类型：
--
作者：
Ishikawa, Fumihiro;Eguchi, Naoya;Yamada, Yuh
采用高压合成法制备了BaFe 2As 2单晶样品，并在9.0GPa的高压下测量了其电阻率随温度的变化关系。施加3.0GPa的压力抑制了自旋密度波转变，并在超导转变温度Tc =35 K下诱导了零电阻态的超导性。T-c随压力的增加而单调减小。在3.0GPa的压力下，超导性的出现和自旋-密度波跃迁引起的反常现象的消失同时发生。在3.0 GPa时，BaFe_2As_2发生超导转变，但在较高压力下，超导性受到抑制。
A single-crystalline sample of BaFe2As2 was prepared by high-pressure synthesis, and temperature dependence of resistivity was measured under high pressures of up to 9.0 GPa. Application of 3.0 GPa pressure suppresses the spin-density wave transition and induces superconductivity with the zero resistance state at a superconducting transition temperature T-c=35 K. T-c decreases monotonically with increasing pressure. The appearance of the superconductivity and the disappearance of the anomaly due to the spin-density wave transition occur simultaneously at a pressure of 3.0 GPa. At 3.0 GPa, a superconducting transition is induced in BaFe2As2; however, the superconductivity is suppressed at higher pressure.