Homogeneous coexistence and phase segregation in 1111 iron-based pnictides studied via NMR
Homogeneous coexistence and phase segregation in 1111 iron-based pnictides studied via NMR
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DOI：
10.3938/jkps.62.2004
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发表时间：
2013-07
影响因子：
0.6
通讯作者：
N. Fujiwara;Y. Kamihara;S. Matsuishi;H. Hosono
中科院分区：
文献类型：
--
作者：
N. Fujiwara;Y. Kamihara;S. Matsuishi;H. Hosono
我们对铁基超导体的原型LaFeAsO1−xFx(La1111)和在电子相图中反铁磁(AF)和超导(SC)穹顶有少量重叠的Ca(Fe1−xCOX)AsF(Ca1111)进行了75As和51Co核磁共振测量。在Ca1111系列中，我们发现AF和Sc态在重叠区均匀共存，而在La1111系列中，我们发现在AF-Sc相界附近，顺磁(PM)和Sc磁畴共存。这些磁区的共存表明，在电子相图中，AF和SC的穹顶彼此分离。
We performed 75As and 51Co nuclear magnetic resonance (NMR) measurements on LaFeAsO1−xFx (La1111), a prototype of iron-based superconductors, and on Ca(Fe1−xCox)AsF (Ca1111), which has a small overlap between the antiferromagnetic (AF) and superconducting (SC) domes in the electronic phase diagram. We found in the Ca1111 series that AF and SC states coexist homogeneously in the overlapped region, while in the La1111 series, we found that paramagnetic (PM) and SC domains coexist around the AF-SC phase boundary. The coexistence of these domains indicates that the AF and SC domes segregate from each other in the electronic phase diagram.