Tsoi Georgiy, Stemshorn Andrew K, Vohra Yogesh K, Wu Phillip M, Hsu F C, Huang Y L, Wu M K, Yeh K W, Weir Samuel T
Department of Physics, University of Alabama at Birmingham (UAB), Birmingham, AL 35294, USA.
J Phys Condens Matter. 2009 Jun 10;21(23):232201. doi: 10.1088/0953-8984/21/23/232201. Epub 2009 May 7.
High pressure superconductivity in iron-based superconductor FeSe(0.5)Te(0.5) has been studied up to 15 GPa and 10 K using an eight probe designer diamond anvil in a diamond anvil cell device. Four probe electrical resistance measurements show the onset of superconductivity (T(c)) at 14 K at ambient pressure with T(c) increasing with increasing pressure to 19 K at a pressure of 3.6 GPa. At higher pressures beyond 3.6 GPa, T(c) decreases and extrapolation suggests non-superconducting behavior above 10 GPa. The loss of superconductivity coincides with the pressure induced disordering of the Fe(SeTe)(4) tetrahedra reported at 11 GPa in x-ray diffraction studies at ambient temperature.
利用金刚石对顶砧装置中的八探针定制金刚石对顶砧，在高达15吉帕斯卡和10开尔文的条件下对铁基超导体FeSe(0.5)Te(0.5)中的高压超导性进行了研究。四探针电阻测量表明，在环境压力下，超导转变温度（T(c)）在14开尔文时开始出现，随着压力增加，T(c)升高，在3.6吉帕斯卡的压力下达到19开尔文。在高于3.6吉帕斯卡的更高压力下，T(c)下降，外推结果表明在高于10吉帕斯卡时出现非超导行为。超导性的丧失与在室温下X射线衍射研究中报道的在11吉帕斯卡时由压力诱导的Fe(SeTe)(4)四面体无序化相吻合。
