Microscopic Coexistence of Superconductivity and Antiferromagnetism in Underdoped Ba(Fe1-xRux)2As2
Microscopic Coexistence of Superconductivity and Antiferromagnetism in Underdoped Ba(Fe1-xRux)2As2
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欠掺杂 Ba(Fe1-xRux)2As2 中超导性和反铁磁性的微观共存
DOI：
10.1103/physrevlett.109.197002
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发表时间：
2012-11-07
影响因子：
8.6
通讯作者：
Yu, Weiqiang
中科院分区：
文献类型：
--
作者：
Ma, Long;Ji, G. F.;Yu, Weiqiang
用As-75核磁共振研究了Ba（Fe_（1-x）Rux）（2）As_（2-x）（x = 0.23）的局域电子性质。我们发现了两个相变：在T-N约60 K时到反铁磁性，在T-C约15 K时到超导性。在T-N以下，我们的数据表明该系统是完全磁性的，具有相称的反铁磁结构和0.4 μ（B）/Fe的力矩。自旋-晶格弛豫速率1/T-75（1）在磁性状态下是大的，表明由Ru掺杂引起的高密度的巡游电子。当冷却到T C以下时，磁位福尔斯的1/T-75（1）急剧下降，为反铁磁性和超导性的微观共存提供了明确的证据。
We use As-75 nuclear magnetic resonance to investigate the local electronic properties of Ba(Fe1-xRux)(2)As-2 (x = 0.23). We find two phase transitions: to antiferromagnetism at T-N approximate to 60 K and to superconductivity at T-C approximate to 15 K. Below T-N, our data show that the system is fully magnetic, with a commensurate antiferromagnetic structure and a moment of 0.4 mu(B)/Fe. The spin-lattice relaxation rate 1/T-75(1) is large in the magnetic state, indicating a high density of itinerant electrons induced by Ru doping. On cooling below T-C, 1/T-75(1) on the magnetic sites falls sharply, providing unambiguous evidence for the microscopic coexistence of antiferromagnetism and superconductivity.