铁硫系超导体FeSe1-xSx和FeSe1-yTey的电子phase diagram
Electronic phase diagram of iron chalcogenide superconductors FeSe1-xSx and FeSe1-yTey
摘要：
本文建立了等电子FeSe_（1-x）S_x（0.19 > x > 0.0）和FeSe_（1-y）Tey（0.04 < y < 1.0）单晶的电子相图。采用水热离子脱嵌（HID）法生长了y = 0.04 - 0.30的FeSe 1-yTey晶体。基于比热、电输运和角分辨光电子能谱的组合实验，在HID FeSe 1-yTey样品中没有观察到四方对称破缺过渡到正交相（OH-O）的特征，与在Ts处显示这种过渡的FeSe 1-xSx样品相比。一个无处不在的蘸样的温度依赖性的霍尔系数观察周围的特征温度T* 在四极制度，这是远远高于超导转变。更重要的是，我们发现，超导转变温度Tc是正相关的霍尔浸渍温度T* 在整个FeSe 1-xSx和FeSe 1-yTey系统，这表明，tetraxO 2背景是一个基本的主机的超导电性。
英文摘要：
Here we establish a combined electronic phase diagram of isoelectronic FeSe1-xSx (0.19 > x > 0.0) and FeSe1-yTey (0.04 < y < 1.0) single crystals. The FeSe1-yTey crystals with y = 0.04 - 0.30 are grown by a hydrothermal ion-deintercalation (HID) method. Based on combined experiments of the specific heat, electrical transport, and angle-resolved photoemission spectroscopy, no signature of the tetragonal-symmetry-broken transition to orthorhombic (nematic) phase is observed in the HID FeSe1-yTey samples, as compared with the FeSe1-xSx samples showing this transition at Ts. A ubiquitous dip-like temperature dependence of the Hall coefficient is observed around a characteristic temperature T* in the tetragonal regimes, which is well above the superconducting transition. More importantly, we find that the superconducting transition temperature Tc is positively correlated with the Hall-dip temperature T* across the FeSe1-xSx and FeSe1-yTey systems, suggesting that the tetragonal background is a fundamental host for the superconductivity.
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