Absence of superconductivity in the collapsed tetragonal phase of KFe2As2 under hydrostatic pressure
Absence of superconductivity in the collapsed tetragonal phase of KFe2As2 under hydrostatic pressure
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KFe2As2 塌陷四方相在静水压力下不存在超导性
DOI：
10.1103/physrevb.94.020502
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发表时间：
2016
影响因子：
3.7
通讯作者：
Uwatoko Yoshiya
中科院分区：
文献类型：
--
作者：
Wang Bosen;Matsubayashi Kazuyuki;Cheng Jinguang;Terashima Taichi;Kihou Kunihiro;Ishida Shigeyuki;Lee Chul-Ho;Iyo Akira;Eisaki Hiroshi;Uwatoko Yoshiya
在17.5GPa以下的不同静压条件下，测量了单晶电阻率的温度依赖性，温度范围从20 mK以下。随着压力的增加，四方晶系的超导转变逐渐受到抑制，在11 GPa时完全消失，这与压力下电子关联和/或临界涨落的减弱有关.与以前的报道形成鲜明对比的是，在进一步增加压力时，没有超导相出现，直到崩溃的四方形。我们认为，这种差异可以归因于不同的压力装置或同质性。
Temperature dependence of resistivity onsingle crystals down to 20 mK was measured under various hydrostatic pressures up to 17.5 GPa generated in a cubic-anvil cell. With increasing the pressure, the superconducting transition of tetragonalwas suppressed gradually and disappears completely at ∼11 GPa, which was related to the weakening of electronic correlations and/or critical fluctuations under pressure. In sharp contrast to previous reports, no superconducting phase emerges upon further increasing pressures until the collapsed tetragonalforms. We argue that such a discrepancy can be attributed to the different pressure apparatus or homogeneity.