Preparation of new superconductors by metal doping of two-dimensional layered materials using ethylenediamine
Preparation of new superconductors by metal doping of two-dimensional layered materials using ethylenediamine
复制标题
乙二胺金属掺杂二维层状材料制备新型超导体
DOI：
10.1103/physrevb.96.014502
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发表时间：
2017
影响因子：
3.7
通讯作者：
Yoshihiro Kubozono
中科院分区：
文献类型：
--
作者：
Xiao Miao;Takahiro Terao;Xiaofan Yang;Saki Nishiyama;Takafumi Miyazaki, Hidenori Goto;Yoshihiro Iwasa;Yoshihiro Kubozono
我们已经研究了新的超导体制备的金属掺杂的二维（2D）层状材料，FeSe和，使用乙二胺（EDA）。金属掺杂的FeSe和金属掺杂的FeSe的超导转变温度（），即，Li、Na和K的温度范围分别为31-45 K和19-25 K。每个样品的化学计量通过能量色散X射线（EDX）光谱进行澄清，和X-射线粉末衍射图案表明晶格常数的大的扩展，表明金属原子和EDA的共嵌入。在压力下研究了超导性的压力依赖性，表明与同样的方式负压力依赖性。从和的相图中重新绘制了和的相图，表明随着的增大，和的相图也增大，但在的极端膨胀时，和的相图则相反。
We have studied new superconductors prepared by metal doping of two-dimensional (2D) layered materials, FeSe and, using ethylenediamine (EDA). The superconducting transition temperatures () of metal-doped FeSe and metal-doped, i.e.,and(: Li, Na, and K), were 31–45 K and 19–25 K, respectively. The stoichiometry of each sample was clarified by energy dispersive x-ray (EDX) spectroscopy, and the x-ray powder diffraction pattern indicated a large expansion of lattice constant, indicating the cointercalation of metal atoms and EDA. The pressure dependence of superconductivity inhas been investigated at a pressure of, showing negative pressure dependence in the same manner as. Thephase diagrams ofandwere drawn afresh from theandofand, showing that theincreases with increasingbut that extreme expansion ofreverses thetrend.