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arXiv 1210.3603cond-mat.supr-concond-mat.mtrl-scicond-mat.other
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Ba0.5Sr 0.5Fe 2As 2的压致超导电性

Pressure Induced Superconductivity in Ba0.5Sr0.5Fe2As2

Georgiy M. Tsoi, Walter Malone, Walter Uhoya, Jonathan E. Mitchel, Yogesh K. Vohra, Lowell E. Wenger, Athena S. Sefat, S. T . Weir

摘要:

高压电阻测量单晶Ba 0.5Sr 0.5Fe 2As 2片已进行到16 GPa的压力和温度下降到10 K下使用设计师金刚石砧准流体静力学条件下的绝缘滑石压力介质。电阻测量结果表明,压力诱导的超导性的证据与开始转变温度在~31 K和零电阻在~22 K的压力为3.3 GPa。相变温度随着压力的增加而逐渐降低,当压力大于12 GPa时,相变温度完全消失。目前的结果提供了实验证据,两种122型材料的固溶体,例如,Ba_(1-x)·Sr_xFe_2As_2(0

英文摘要:

High-pressure electrical resistance measurements have been performed on single crystal Ba0.5Sr0.5Fe2As2 platelets to pressures of 16 GPa and temperatures down to 10 K using designer diamond anvils under quasi-hydrostatic conditions with an insulating steatite pressure medium. The resistance measurements show evidence of pressure-induced superconductivity with an onset transition temperature at ~31 K and zero resistance at ~22 K for a pressure of 3.3 GPa. The transition temperature decreases gradually with increasing in pressure before completely disappearing for pressures above 12 GPa. The present results provide experimental evidence that a solid solution of two 122-type materials, e.g., Ba1-x.SrxFe2As2 (0 < x <1), can also exhibit superconductivity under high pressure

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